添加了快照功能支持，支持定时快照和回滚快照

backend/internal/api/handlers.go

@@ -69,6 +69,8 @@ func HandleSingleContainer(w http.ResponseWriter, r *http.Request) {
 		updateExpiry(w, r, id)
 	case action == "ipv6" && r.Method == http.MethodPost:
 		assignIPv6(w, r, id)
+	case action == "snapshots" || strings.HasPrefix(action, "snapshots/"):
+		handleContainerSnapshots(w, r, id, action)
 	case action == "port-mappings" && r.Method == http.MethodPost:
 		addPortMapping(w, r, id)
 	case strings.HasPrefix(action, "port-mappings/") && r.Method == http.MethodPut:
@@ -121,6 +123,9 @@ func createContainer(w http.ResponseWriter, r *http.Request) {
 		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: "Port mapping count cannot exceed 64"})
 		return
 	}
+	if cfg.SnapshotLimit <= 0 {
+		cfg.SnapshotLimit = config.DefaultSnapshotLimit
+	}
 	if err := validateContainerResourceRequest(cfg.VCPU, cfg.RAMMB, cfg.DiskGB); err != nil {
 		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: err.Error()})
 		return

backend/internal/api/oversell.go

@@ -34,6 +34,9 @@ func updateOversell(w http.ResponseWriter, r *http.Request) {
 		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: "Invalid request body"})
 		return
 	}
+	if cfg.SubUserSnapshotLimit <= 0 {
+		cfg.SubUserSnapshotLimit = 3
+	}
 
 	// Apply KSM
 	if cfg.KSMEnabled {

backend/internal/api/snapshots.go

@@ -0,0 +1,206 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"clicd/internal/config"
+)
+
+func HandleSnapshots(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		jsonResponse(w, http.StatusMethodNotAllowed, APIResponse{Success: false, Message: "Method not allowed"})
+		return
+	}
+	snapshots := append([]config.Snapshot(nil), config.AppConfig.Snapshots...)
+	sortSnapshotsNewestFirst(snapshots)
+	jsonResponse(w, http.StatusOK, APIResponse{Success: true, Data: snapshots})
+}
+
+func handleContainerSnapshots(w http.ResponseWriter, r *http.Request, containerID int, action string) {
+	switch {
+	case action == "snapshots" && r.Method == http.MethodGet:
+		listContainerSnapshots(w, r, containerID)
+	case action == "snapshots" && r.Method == http.MethodPost:
+		createContainerSnapshot(w, r, containerID)
+	case action == "snapshots/schedule" && r.Method == http.MethodPost:
+		updateSnapshotSchedule(w, r, containerID)
+	case action == "snapshots/quota" && r.Method == http.MethodPut:
+		updateSnapshotQuota(w, r, containerID)
+	case strings.HasPrefix(action, "snapshots/") && strings.HasSuffix(action, "/restore") && r.Method == http.MethodPost:
+		snapshotID := strings.TrimSuffix(strings.TrimPrefix(action, "snapshots/"), "/restore")
+		restoreContainerSnapshot(w, r, containerID, snapshotID)
+	case strings.HasPrefix(action, "snapshots/") && r.Method == http.MethodDelete:
+		snapshotID := strings.TrimPrefix(action, "snapshots/")
+		deleteContainerSnapshot(w, r, containerID, snapshotID)
+	default:
+		jsonResponse(w, http.StatusNotFound, APIResponse{Success: false, Message: "Snapshot action not found"})
+	}
+}
+
+func listContainerSnapshots(w http.ResponseWriter, r *http.Request, containerID int) {
+	c := config.FindContainer(containerID)
+	if c == nil {
+		jsonResponse(w, http.StatusNotFound, APIResponse{Success: false, Message: "Container not found"})
+		return
+	}
+	snapshots := config.ContainerSnapshots(containerID)
+	sortSnapshotsNewestFirst(snapshots)
+	jsonResponse(w, http.StatusOK, APIResponse{Success: true, Data: map[string]interface{}{
+		"snapshots": snapshots,
+		"quota":     config.ContainerSnapshotLimit(c),
+		"schedule": map[string]interface{}{
+			"enabled":        c.SnapshotScheduleEnabled,
+			"interval_hours": c.SnapshotScheduleIntervalHours,
+			"time":           c.SnapshotScheduleTime,
+			"last_run":       c.SnapshotScheduleLastRun,
+			"next_run":       c.SnapshotScheduleNextRun,
+			"created_by":     c.SnapshotScheduleCreatedBy,
+		},
+	}})
+}
+
+func createContainerSnapshot(w http.ResponseWriter, r *http.Request, containerID int) {
+	user := requestUser(r)
+	if isSubUserRequest(r) {
+		c := config.FindContainer(containerID)
+		limit := config.ContainerSnapshotLimit(c)
+		if len(config.ContainerSnapshots(containerID)) >= limit {
+			jsonResponse(w, http.StatusForbidden, APIResponse{Success: false, Message: "Snapshot quota reached. Delete an old snapshot first."})
+			return
+		}
+	}
+	snapshot, err := lxcManager.CreateSnapshot(containerID, user, false, 0)
+	if err != nil {
+		jsonResponse(w, http.StatusInternalServerError, APIResponse{Success: false, Message: err.Error()})
+		return
+	}
+	config.AddAuditLog("snapshot.create", snapshot.ContainerName, snapshot.ID, user)
+	jsonResponse(w, http.StatusCreated, APIResponse{Success: true, Data: snapshot})
+}
+
+func updateSnapshotQuota(w http.ResponseWriter, r *http.Request, containerID int) {
+	if isSubUserRequest(r) {
+		jsonResponse(w, http.StatusForbidden, APIResponse{Success: false, Message: "Sub-users cannot change snapshot quota"})
+		return
+	}
+	var req struct {
+		SnapshotLimit int `json:"snapshot_limit"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: "Invalid request body"})
+		return
+	}
+	if req.SnapshotLimit <= 0 {
+		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: "Snapshot quota must be at least 1"})
+		return
+	}
+	c := config.FindContainer(containerID)
+	if c == nil {
+		jsonResponse(w, http.StatusNotFound, APIResponse{Success: false, Message: "Container not found"})
+		return
+	}
+	c.SnapshotLimit = req.SnapshotLimit
+	if err := config.SaveConfig(); err != nil {
+		jsonResponse(w, http.StatusInternalServerError, APIResponse{Success: false, Message: "Failed to save config"})
+		return
+	}
+	user := requestUser(r)
+	config.AddAuditLog("snapshot.quota", c.Name, "limit="+strconv.Itoa(req.SnapshotLimit), user)
+	jsonResponse(w, http.StatusOK, APIResponse{Success: true, Data: map[string]interface{}{
+		"container": c,
+		"quota":     c.SnapshotLimit,
+	}})
+}
+
+func updateSnapshotSchedule(w http.ResponseWriter, r *http.Request, containerID int) {
+	var req struct {
+		Enabled       bool   `json:"enabled"`
+		IntervalHours int    `json:"interval_hours"`
+		Time          string `json:"time"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: "Invalid request body"})
+		return
+	}
+	if req.IntervalHours <= 0 {
+		req.IntervalHours = 24
+	}
+	if req.IntervalHours < 24 {
+		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: "Snapshot schedule interval cannot be less than 24 hours"})
+		return
+	}
+	if req.Time == "" {
+		req.Time = "03:00"
+	}
+	user := requestUser(r)
+	c, err := lxcManager.SetSnapshotSchedule(containerID, req.Enabled, req.IntervalHours, req.Time, user)
+	if err != nil {
+		jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: err.Error()})
+		return
+	}
+
+	if req.Enabled {
+		config.AddAuditLog("snapshot.schedule", c.Name, "enabled", user)
+	} else {
+		config.AddAuditLog("snapshot.schedule", c.Name, "disabled", user)
+	}
+
+	jsonResponse(w, http.StatusOK, APIResponse{Success: true, Data: map[string]interface{}{
+		"container": c,
+	}})
+}
+
+func deleteContainerSnapshot(w http.ResponseWriter, r *http.Request, containerID int, snapshotID string) {
+	snapshot := config.FindSnapshot(snapshotID)
+	if snapshot == nil || snapshot.ContainerID != containerID {
+		jsonResponse(w, http.StatusNotFound, APIResponse{Success: false, Message: "Snapshot not found"})
+		return
+	}
+	user := requestUser(r)
+	if err := lxcManager.DeleteSnapshot(snapshotID); err != nil {
+		jsonResponse(w, http.StatusInternalServerError, APIResponse{Success: false, Message: err.Error()})
+		return
+	}
+	config.AddAuditLog("snapshot.delete", snapshot.ContainerName, snapshot.ID, user)
+	jsonResponse(w, http.StatusOK, APIResponse{Success: true, Message: "Snapshot deleted"})
+}
+
+func restoreContainerSnapshot(w http.ResponseWriter, r *http.Request, containerID int, snapshotID string) {
+	snapshot := config.FindSnapshot(snapshotID)
+	if snapshot == nil || snapshot.ContainerID != containerID {
+		jsonResponse(w, http.StatusNotFound, APIResponse{Success: false, Message: "Snapshot not found"})
+		return
+	}
+	user := requestUser(r)
+	if err := lxcManager.RestoreSnapshot(snapshotID); err != nil {
+		jsonResponse(w, http.StatusInternalServerError, APIResponse{Success: false, Message: err.Error()})
+		return
+	}
+	config.AddAuditLog("snapshot.restore", snapshot.ContainerName, snapshot.ID, user)
+	jsonResponse(w, http.StatusOK, APIResponse{Success: true, Message: "Snapshot restored"})
+}
+
+func requestUser(r *http.Request) string {
+	if claims, ok := claimsFromRequest(r); ok {
+		if subUser, _ := claims["sub_user"].(string); subUser != "" {
+			return "user:" + subUser
+		}
+		if username, _ := claims["username"].(string); username != "" {
+			return username
+		}
+	}
+	return "admin"
+}
+
+func sortSnapshotsNewestFirst(snapshots []config.Snapshot) {
+	sort.SliceStable(snapshots, func(i, j int) bool {
+		ti, _ := time.Parse("2006-01-02 15:04:05", snapshots[i].CreatedAt)
+		tj, _ := time.Parse("2006-01-02 15:04:05", snapshots[j].CreatedAt)
+		return tj.Before(ti)
+	})
+}

backend/internal/api/subuser.go

@@ -377,6 +377,12 @@ func isSubUserContainerActionAllowed(action string, method string) bool {
 	switch {
 	case action == "usage" || action == "traffic" || action == "random-port":
 		return method == http.MethodGet
+	case action == "snapshots":
+		return method == http.MethodGet || method == http.MethodPost
+	case action == "snapshots/schedule":
+		return method == http.MethodPost
+	case strings.HasPrefix(action, "snapshots/"):
+		return method == http.MethodDelete || method == http.MethodPost
 	case action == "start" || action == "stop" || action == "restart" || action == "reinstall":
 		return method == http.MethodPost
 	case strings.HasPrefix(action, "port-mappings/"):

backend/internal/api/taskqueue.go

@@ -504,6 +504,12 @@ func HandleBatchCreate(w http.ResponseWriter, r *http.Request) {
 		if req.Containers[i].DiskGB < 1 {
 			req.Containers[i].DiskGB = 5
 		}
+		if req.Containers[i].PortMappingCount < 2 {
+			req.Containers[i].PortMappingCount = 2
+		}
+		if req.Containers[i].SnapshotLimit <= 0 {
+			req.Containers[i].SnapshotLimit = config.DefaultSnapshotLimit
+		}
 		if err := validateContainerResourceRequest(req.Containers[i].VCPU, req.Containers[i].RAMMB, req.Containers[i].DiskGB); err != nil {
 			jsonResponse(w, http.StatusBadRequest, APIResponse{Success: false, Message: name + ": " + err.Error()})
 			return

backend/internal/config/config.go

@@ -61,6 +61,7 @@ type OversellConfig struct {
 	DiskOvercommit       int  `json:"disk_overcommit"`         // multiplier
 	KSMEnabled           bool `json:"ksm_enabled"`             // kernel same-page merging
 	Swappiness           int  `json:"swappiness"`              // 0-100, lower = less swap
+	SubUserSnapshotLimit int  `json:"sub_user_snapshot_limit"` // legacy default for migrating old containers
 }
 
 // Container represents an LXC container configuration
@@ -92,8 +93,15 @@ type Container struct {
 	SSHPassword                   string        `json:"ssh_password"`
 	PortMappings                  []PortMapping `json:"port_mappings"`
 	PortMappingLimit              int           `json:"port_mapping_limit"`
+	SnapshotLimit                 int           `json:"snapshot_limit"`
 	CreatedAt                     string        `json:"created_at"`
 	ExpiresAt                     string        `json:"expires_at"`
+	SnapshotScheduleEnabled       bool          `json:"snapshot_schedule_enabled"`
+	SnapshotScheduleIntervalHours int           `json:"snapshot_schedule_interval_hours"`
+	SnapshotScheduleTime          string        `json:"snapshot_schedule_time"`
+	SnapshotScheduleLastRun       string        `json:"snapshot_schedule_last_run"`
+	SnapshotScheduleNextRun       string        `json:"snapshot_schedule_next_run"`
+	SnapshotScheduleCreatedBy     string        `json:"snapshot_schedule_created_by"`
 }
 
 // LxcName returns the internal LXC container name (ct-{id})
@@ -138,6 +146,18 @@ type SubUser struct {
 	CreatedAt      string   `json:"created_at"`
 }
 
+type Snapshot struct {
+	ID            string `json:"id"`
+	ContainerID   int    `json:"container_id"`
+	ContainerName string `json:"container_name"`
+	LXCName       string `json:"lxc_name"`
+	CreatedAt     string `json:"created_at"`
+	CreatedBy     string `json:"created_by"`
+	Scheduled     bool   `json:"scheduled"`
+	Path          string `json:"path"`
+	SizeBytes     int64  `json:"size_bytes"`
+}
+
 // ClicdConfig is the main configuration structure
 type ClicdConfig struct {
 	AdminUser       string          `json:"admin_user"`
@@ -157,11 +177,14 @@ type ClicdConfig struct {
 	Tasks           []SavedTask     `json:"tasks"`
 	LoginLogs       []SavedLoginLog `json:"login_logs"`
 	EnabledImages   []string        `json:"enabled_images"`
+	Snapshots       []Snapshot      `json:"snapshots"`
 }
 
 var configPath string
 var AppConfig *ClicdConfig
 
+const DefaultSnapshotLimit = 3
+
 func getConfigPath() string {
 	if configPath != "" {
 		return configPath
@@ -254,7 +277,9 @@ func InitConfig() (*ClicdConfig, error) {
 				DiskOvercommit:       2,
 				KSMEnabled:           true,
 				Swappiness:           10,
+				SubUserSnapshotLimit: 3,
 			},
+			Snapshots: []Snapshot{},
 		}
 
 		if err := SaveConfig(); err != nil {
@@ -304,10 +329,22 @@ func InitConfig() (*ClicdConfig, error) {
 	if AppConfig.Containers == nil {
 		AppConfig.Containers = make([]Container, 0)
 	}
+	if AppConfig.Snapshots == nil {
+		AppConfig.Snapshots = make([]Snapshot, 0)
+	}
+	if AppConfig.Oversell.SubUserSnapshotLimit <= 0 {
+		AppConfig.Oversell.SubUserSnapshotLimit = 3
+	}
 	changed := ensureContainerUUIDs()
 	if ensureContainerPortMappingLimits() {
 		changed = true
 	}
+	if ensureContainerSnapshotLimits() {
+		changed = true
+	}
+	if ensureContainerSnapshotScheduleDefaults() {
+		changed = true
+	}
 	if removeLegacyVNCMappings() {
 		changed = true
 	}
@@ -320,6 +357,21 @@ func InitConfig() (*ClicdConfig, error) {
 	return AppConfig, nil
 }
 
+func ensureContainerSnapshotScheduleDefaults() bool {
+	changed := false
+	for i := range AppConfig.Containers {
+		if AppConfig.Containers[i].SnapshotScheduleEnabled && AppConfig.Containers[i].SnapshotScheduleIntervalHours < 24 {
+			AppConfig.Containers[i].SnapshotScheduleIntervalHours = 24
+			changed = true
+		}
+		if AppConfig.Containers[i].SnapshotScheduleEnabled && AppConfig.Containers[i].SnapshotScheduleTime == "" {
+			AppConfig.Containers[i].SnapshotScheduleTime = "03:00"
+			changed = true
+		}
+	}
+	return changed
+}
+
 func ensureContainerUUIDs() bool {
 	changed := false
 	used := make(map[string]bool)
@@ -355,6 +407,35 @@ func ensureContainerPortMappingLimits() bool {
 	return changed
 }
 
+func ensureContainerSnapshotLimits() bool {
+	changed := false
+	legacyLimit := AppConfig.Oversell.SubUserSnapshotLimit
+	if legacyLimit <= 0 {
+		legacyLimit = DefaultSnapshotLimit
+	}
+	for i := range AppConfig.Containers {
+		if AppConfig.Containers[i].SnapshotLimit <= 0 {
+			AppConfig.Containers[i].SnapshotLimit = legacyLimit
+			changed = true
+		}
+	}
+	return changed
+}
+
+func NormalizeSnapshotLimit(limit int) int {
+	if limit <= 0 {
+		return DefaultSnapshotLimit
+	}
+	return limit
+}
+
+func ContainerSnapshotLimit(c *Container) int {
+	if c == nil {
+		return DefaultSnapshotLimit
+	}
+	return NormalizeSnapshotLimit(c.SnapshotLimit)
+}
+
 func removeLegacyVNCMappings() bool {
 	changed := false
 	for i := range AppConfig.Containers {
@@ -408,6 +489,7 @@ func RemoveContainer(id int) bool {
 	for i, c := range AppConfig.Containers {
 		if c.ID == id {
 			removeSubUserContainerAccess(c.Name)
+			removeContainerSnapshotMetadata(id)
 			AppConfig.Containers = append(AppConfig.Containers[:i], AppConfig.Containers[i+1:]...)
 			SaveConfig()
 			return true
@@ -416,6 +498,51 @@ func RemoveContainer(id int) bool {
 	return false
 }
 
+func AddSnapshot(snapshot Snapshot) {
+	AppConfig.Snapshots = append(AppConfig.Snapshots, snapshot)
+	SaveConfig()
+}
+
+func FindSnapshot(id string) *Snapshot {
+	for i := range AppConfig.Snapshots {
+		if AppConfig.Snapshots[i].ID == id {
+			return &AppConfig.Snapshots[i]
+		}
+	}
+	return nil
+}
+
+func RemoveSnapshot(id string) bool {
+	for i := range AppConfig.Snapshots {
+		if AppConfig.Snapshots[i].ID == id {
+			AppConfig.Snapshots = append(AppConfig.Snapshots[:i], AppConfig.Snapshots[i+1:]...)
+			SaveConfig()
+			return true
+		}
+	}
+	return false
+}
+
+func ContainerSnapshots(containerID int) []Snapshot {
+	result := make([]Snapshot, 0)
+	for _, snapshot := range AppConfig.Snapshots {
+		if snapshot.ContainerID == containerID {
+			result = append(result, snapshot)
+		}
+	}
+	return result
+}
+
+func removeContainerSnapshotMetadata(containerID int) {
+	filtered := make([]Snapshot, 0, len(AppConfig.Snapshots))
+	for _, snapshot := range AppConfig.Snapshots {
+		if snapshot.ContainerID != containerID {
+			filtered = append(filtered, snapshot)
+		}
+	}
+	AppConfig.Snapshots = filtered
+}
+
 func removeSubUserContainerAccess(containerName string) {
 	if containerName == "" || len(AppConfig.SubUsers) == 0 {
 		return

backend/internal/lxc/lxc.go

@@ -216,6 +216,7 @@ type ContainerConfig struct {
 	IOSpeedMBps      int     `json:"io_speed_mbps"`
 	ExtraPorts       []int   `json:"extra_ports"`
 	PortMappingCount int     `json:"port_mapping_count"`
+	SnapshotLimit    int     `json:"snapshot_limit"`
 	AssignIPv6       bool    `json:"assign_ipv6"`
 	ExpiresAt        string  `json:"expires_at"`
 }
@@ -226,6 +227,12 @@ func (m *Manager) CreateContainer(cfg ContainerConfig) error {
 	if tmpl == nil {
 		return fmt.Errorf("template not found: %s", cfg.TemplateID)
 	}
+	if cfg.PortMappingCount < 2 {
+		cfg.PortMappingCount = 2
+	}
+	if cfg.SnapshotLimit <= 0 {
+		cfg.SnapshotLimit = config.DefaultSnapshotLimit
+	}
 
 	if !config.IsValidContainerName(cfg.Name) {
 		return fmt.Errorf("invalid container name: %s", cfg.Name)
@@ -351,6 +358,7 @@ func (m *Manager) CreateContainer(cfg ContainerConfig) error {
 		SSHPassword:      sshPassword,
 		PortMappings:     portMappings,
 		PortMappingLimit: cfg.PortMappingCount,
+		SnapshotLimit:    config.NormalizeSnapshotLimit(cfg.SnapshotLimit),
 		CreatedAt:        now,
 		ExpiresAt:        cfg.ExpiresAt,
 	}
@@ -1458,6 +1466,10 @@ func (m *Manager) DestroyContainer(id int) error {
 		}
 		return fmt.Errorf("container still exists after cleanup with status %s", status)
 	}
+	snapshotDir := filepath.Join(snapshotBaseDir(), lxcName)
+	if err := safePathUnder(snapshotDir, snapshotBaseDir()); err == nil {
+		os.RemoveAll(snapshotDir)
+	}
 
 	if !config.RemoveContainer(id) {
 		return fmt.Errorf("container destroyed but config entry was not removed: %d", id)
@@ -1986,6 +1998,7 @@ func (m *Manager) ImportExistingClicdContainers() ([]config.Container, error) {
 			Status:           status,
 			CreatedAt:        time.Now().Format(time.RFC3339),
 			PortMappingLimit: 2,
+			SnapshotLimit:    config.DefaultSnapshotLimit,
 		}
 
 		if status == "running" {

backend/internal/lxc/snapshot.go

@@ -0,0 +1,349 @@
+package lxc
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"clicd/internal/config"
+)
+
+var snapshotMu sync.Mutex
+
+func (m *Manager) CreateSnapshot(id int, createdBy string, scheduled bool, rotateLimit int) (config.Snapshot, error) {
+	snapshotMu.Lock()
+	defer snapshotMu.Unlock()
+
+	c := config.FindContainer(id)
+	if c == nil {
+		return config.Snapshot{}, fmt.Errorf("container not found: %d", id)
+	}
+	if scheduled && rotateLimit > 0 {
+		for {
+			existing := config.ContainerSnapshots(id)
+			if len(existing) < rotateLimit {
+				break
+			}
+			sortSnapshotsOldestFirst(existing)
+			if err := m.deleteSnapshotLocked(existing[0]); err != nil {
+				return config.Snapshot{}, err
+			}
+		}
+	}
+
+	lxcName := c.LxcName()
+	containerDir := filepath.Join(m.LxcPath, lxcName)
+	if _, err := os.Stat(containerDir); err != nil {
+		return config.Snapshot{}, fmt.Errorf("container storage not found: %v", err)
+	}
+
+	now := time.Now()
+	snapshotID := fmt.Sprintf("snap-%d-%s", id, now.Format("20060102150405-000000000"))
+	snapshotDir := filepath.Join(snapshotBaseDir(), lxcName, snapshotID)
+	if err := safePathUnder(snapshotDir, snapshotBaseDir()); err != nil {
+		return config.Snapshot{}, err
+	}
+	if err := os.MkdirAll(snapshotDir, 0700); err != nil {
+		return config.Snapshot{}, err
+	}
+
+	wasRunning, err := m.prepareContainerForColdCopy(id, lxcName, containerDir)
+	if err != nil {
+		os.RemoveAll(snapshotDir)
+		return config.Snapshot{}, err
+	}
+	if wasRunning {
+		defer func() {
+			if err := m.StartContainer(id); err != nil {
+				fmt.Printf("Warning: failed to restart %s after snapshot: %v\n", lxcName, err)
+			}
+		}()
+	}
+
+	if err := copyTree(containerDir, snapshotDir); err != nil {
+		os.RemoveAll(snapshotDir)
+		return config.Snapshot{}, err
+	}
+
+	snapshot := config.Snapshot{
+		ID:            snapshotID,
+		ContainerID:   c.ID,
+		ContainerName: c.Name,
+		LXCName:       lxcName,
+		CreatedAt:     now.Format("2006-01-02 15:04:05"),
+		CreatedBy:     createdBy,
+		Scheduled:     scheduled,
+		Path:          snapshotDir,
+		SizeBytes:     dirSizeBytes(snapshotDir),
+	}
+	config.AddSnapshot(snapshot)
+	return snapshot, nil
+}
+
+func (m *Manager) DeleteSnapshot(id string) error {
+	snapshotMu.Lock()
+	defer snapshotMu.Unlock()
+
+	snapshot := config.FindSnapshot(id)
+	if snapshot == nil {
+		return fmt.Errorf("snapshot not found: %s", id)
+	}
+	return m.deleteSnapshotLocked(*snapshot)
+}
+
+func (m *Manager) deleteSnapshotLocked(snapshot config.Snapshot) error {
+	if snapshot.Path != "" {
+		if err := safePathUnder(snapshot.Path, snapshotBaseDir()); err != nil {
+			return err
+		}
+		if err := os.RemoveAll(snapshot.Path); err != nil {
+			return fmt.Errorf("failed to delete snapshot files: %v", err)
+		}
+	}
+	config.RemoveSnapshot(snapshot.ID)
+	return nil
+}
+
+func (m *Manager) RestoreSnapshot(id string) error {
+	snapshotMu.Lock()
+	defer snapshotMu.Unlock()
+
+	snapshot := config.FindSnapshot(id)
+	if snapshot == nil {
+		return fmt.Errorf("snapshot not found: %s", id)
+	}
+	if snapshot.Path == "" {
+		return fmt.Errorf("snapshot path is empty")
+	}
+	if err := safePathUnder(snapshot.Path, snapshotBaseDir()); err != nil {
+		return err
+	}
+	if _, err := os.Stat(snapshot.Path); err != nil {
+		return fmt.Errorf("snapshot files not found: %v", err)
+	}
+
+	c := config.FindContainer(snapshot.ContainerID)
+	if c == nil {
+		return fmt.Errorf("container not found: %d", snapshot.ContainerID)
+	}
+	lxcName := c.LxcName()
+	containerDir := filepath.Join(m.LxcPath, lxcName)
+	if err := safePathUnder(containerDir, m.LxcPath); err != nil {
+		return err
+	}
+
+	wasRunning, err := m.prepareContainerForColdCopy(c.ID, lxcName, containerDir)
+	if err != nil {
+		return err
+	}
+
+	backupDir := filepath.Join(m.LxcPath, fmt.Sprintf(".%s-restore-backup-%d", lxcName, time.Now().UnixNano()))
+	if err := safePathUnder(backupDir, m.LxcPath); err != nil {
+		return err
+	}
+	if err := os.Rename(containerDir, backupDir); err != nil && !os.IsNotExist(err) {
+		return fmt.Errorf("failed to move current container aside: %v", err)
+	}
+
+	if err := copyTree(snapshot.Path, containerDir); err != nil {
+		os.RemoveAll(containerDir)
+		_ = os.Rename(backupDir, containerDir)
+		return fmt.Errorf("failed to restore snapshot: %v", err)
+	}
+	_ = os.RemoveAll(backupDir)
+
+	config.UpdateContainerStatus(c.ID, "stopped")
+	if wasRunning {
+		return m.StartContainer(c.ID)
+	}
+	return nil
+}
+
+func (m *Manager) SetSnapshotSchedule(id int, enabled bool, intervalHours int, scheduleTime string, createdBy string) (*config.Container, error) {
+	c := config.FindContainer(id)
+	if c == nil {
+		return nil, fmt.Errorf("container not found: %d", id)
+	}
+	if intervalHours < 24 {
+		return nil, fmt.Errorf("snapshot schedule interval cannot be less than 24 hours")
+	}
+	if _, err := parseScheduleClock(scheduleTime); err != nil {
+		return nil, err
+	}
+	c.SnapshotScheduleEnabled = enabled
+	c.SnapshotScheduleIntervalHours = intervalHours
+	c.SnapshotScheduleTime = scheduleTime
+	c.SnapshotScheduleCreatedBy = createdBy
+	if enabled {
+		c.SnapshotScheduleNextRun = nextSnapshotRun(time.Now(), intervalHours, scheduleTime).Format(time.RFC3339)
+	} else {
+		c.SnapshotScheduleNextRun = ""
+	}
+	if err := config.SaveConfig(); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+func (m *Manager) StartSnapshotScheduler() {
+	go func() {
+		m.runDueSnapshotSchedules()
+		ticker := time.NewTicker(time.Minute)
+		defer ticker.Stop()
+		for range ticker.C {
+			m.runDueSnapshotSchedules()
+		}
+	}()
+}
+
+func (m *Manager) runDueSnapshotSchedules() {
+	now := time.Now()
+	containers := append([]config.Container(nil), config.AppConfig.Containers...)
+	for _, c := range containers {
+		if !c.SnapshotScheduleEnabled {
+			continue
+		}
+		nextRun, err := time.Parse(time.RFC3339, c.SnapshotScheduleNextRun)
+		if err != nil || c.SnapshotScheduleNextRun == "" {
+			nextRun = now
+		}
+		if now.Before(nextRun) {
+			continue
+		}
+		createdBy := c.SnapshotScheduleCreatedBy
+		if createdBy == "" {
+			createdBy = "admin"
+		}
+		rotateLimit := 0
+		if strings.HasPrefix(createdBy, "user:") {
+			rotateLimit = config.ContainerSnapshotLimit(&c)
+		}
+		if _, err := m.CreateSnapshot(c.ID, createdBy, true, rotateLimit); err != nil {
+			fmt.Printf("Warning: scheduled snapshot failed for %s: %v\n", c.Name, err)
+			continue
+		}
+		if current := config.FindContainer(c.ID); current != nil {
+			interval := current.SnapshotScheduleIntervalHours
+			if interval < 24 {
+				interval = 24
+			}
+			next := nextRun.Add(time.Duration(interval) * time.Hour)
+			for !next.After(now) {
+				next = next.Add(time.Duration(interval) * time.Hour)
+			}
+			current.SnapshotScheduleLastRun = now.Format(time.RFC3339)
+			current.SnapshotScheduleNextRun = next.Format(time.RFC3339)
+			config.SaveConfig()
+		}
+	}
+}
+
+func parseScheduleClock(value string) (time.Duration, error) {
+	parts := strings.Split(value, ":")
+	if len(parts) != 2 {
+		return 0, fmt.Errorf("snapshot schedule time must be HH:MM")
+	}
+	hour, err := strconv.Atoi(parts[0])
+	if err != nil || hour < 0 || hour > 23 {
+		return 0, fmt.Errorf("snapshot schedule hour must be 00-23")
+	}
+	minute, err := strconv.Atoi(parts[1])
+	if err != nil || minute < 0 || minute > 59 {
+		return 0, fmt.Errorf("snapshot schedule minute must be 00-59")
+	}
+	return time.Duration(hour)*time.Hour + time.Duration(minute)*time.Minute, nil
+}
+
+func nextSnapshotRun(from time.Time, intervalHours int, scheduleTime string) time.Time {
+	clock, err := parseScheduleClock(scheduleTime)
+	if err != nil {
+		clock = 3 * time.Hour
+	}
+	midnight := time.Date(from.Year(), from.Month(), from.Day(), 0, 0, 0, 0, from.Location())
+	next := midnight.Add(clock)
+	interval := time.Duration(intervalHours) * time.Hour
+	for !next.After(from) {
+		next = next.Add(interval)
+	}
+	return next
+}
+
+func (m *Manager) prepareContainerForColdCopy(id int, lxcName string, containerDir string) (bool, error) {
+	status, _ := m.GetContainerStatus(lxcName)
+	wasRunning := status == "running"
+	if wasRunning {
+		if err := m.StopContainer(id); err != nil {
+			return false, err
+		}
+		time.Sleep(time.Second)
+	} else if c := config.FindContainer(id); c != nil {
+		m.CleanPortMappings(id)
+		m.cleanupBandwidthLimit(c.LxcName())
+	}
+	rootfs := filepath.Join(containerDir, "rootfs")
+	exec.Command("umount", "-R", "-l", rootfs).Run()
+	m.detachContainerMounts(containerDir)
+	m.detachContainerLoopDevices(containerDir)
+	return wasRunning, nil
+}
+
+func snapshotBaseDir() string {
+	return filepath.Join(config.AppConfig.DataDir, "snapshots")
+}
+
+func copyTree(src string, dst string) error {
+	if err := os.MkdirAll(dst, 0700); err != nil {
+		return err
+	}
+	output, err := exec.Command("cp", "-a", "--sparse=always", "--reflink=auto", src+string(os.PathSeparator)+".", dst+string(os.PathSeparator)).CombinedOutput()
+	if err != nil {
+		output, err = exec.Command("cp", "-a", "--sparse=always", src+string(os.PathSeparator)+".", dst+string(os.PathSeparator)).CombinedOutput()
+		if err != nil {
+			return fmt.Errorf("cp failed: %v, output: %s", err, string(output))
+		}
+	}
+	return nil
+}
+
+func dirSizeBytes(path string) int64 {
+	out, err := exec.Command("du", "-s", "-B1", path).Output()
+	if err != nil {
+		return 0
+	}
+	parts := strings.Fields(string(out))
+	if len(parts) == 0 {
+		return 0
+	}
+	var size int64
+	fmt.Sscanf(parts[0], "%d", &size)
+	return size
+}
+
+func safePathUnder(path string, base string) error {
+	absPath, err := filepath.Abs(path)
+	if err != nil {
+		return err
+	}
+	absBase, err := filepath.Abs(base)
+	if err != nil {
+		return err
+	}
+	if absPath == absBase || strings.HasPrefix(absPath, absBase+string(os.PathSeparator)) {
+		return nil
+	}
+	return fmt.Errorf("refusing unsafe path: %s", absPath)
+}
+
+func sortSnapshotsOldestFirst(snapshots []config.Snapshot) {
+	sort.SliceStable(snapshots, func(i, j int) bool {
+		ti, _ := time.Parse("2006-01-02 15:04:05", snapshots[i].CreatedAt)
+		tj, _ := time.Parse("2006-01-02 15:04:05", snapshots[j].CreatedAt)
+		return ti.Before(tj)
+	})
+}

backend/internal/server/server.go

@@ -50,6 +50,7 @@ func setupRoutes(mux *http.ServeMux) {
 	mux.HandleFunc("/api/images/enabled", corsMiddleware(api.AuthMiddleware(api.SubUserMiddleware(api.HandleEnabledImages))))
 	mux.HandleFunc("/api/dashboard", corsMiddleware(api.AdminMiddleware(api.HandleDashboard)))
 	mux.HandleFunc("/api/host-info", corsMiddleware(api.AdminMiddleware(api.HandleHostInfo)))
+	mux.HandleFunc("/api/snapshots", corsMiddleware(api.AdminMiddleware(api.HandleSnapshots)))
 	mux.HandleFunc("/api/ipv6/status", corsMiddleware(api.AdminMiddleware(api.HandleIPv6Status)))
 	mux.HandleFunc("/api/oversell", corsMiddleware(api.AdminMiddleware(api.HandleOversell)))
 	mux.HandleFunc("/api/oversell/status", corsMiddleware(api.AdminMiddleware(api.HandleOversellStatus)))

backend/main.go

@@ -60,6 +60,9 @@ func main() {
 		// Start usage monitor (computes CPU/network/disk rates every 5s)
 		manager.StartUsageMonitor()
 
+		// Start scheduled snapshot scanner.
+		manager.StartSnapshotScheduler()
+
 		// Clean up stale container configs (LXC dir was deleted but config remains)
 		config.CleanStaleContainers()
 

frontend/src/App.tsx

@@ -10,6 +10,7 @@ import AuditLogs from './pages/AuditLogs'
 import ApiIntegration from './pages/ApiIntegration'
 import Settings from './pages/Settings'
 import ImageManagement from './pages/ImageManagement'
+import Snapshots from './pages/Snapshots'
 import Layout from './components/Layout'
 
 function ProtectedRoute({ children }: { children: React.ReactNode }) {
@@ -57,6 +58,7 @@ function App() {
         <Route path="container/:id" element={<ContainerDetail />} />
         <Route path="oversell" element={<Oversell />} />
         <Route path="security" element={<Security />} />
+        <Route path="snapshots" element={<Snapshots />} />
         <Route path="audit-logs" element={<AuditLogs />} />
         <Route path="api-integration" element={<ApiIntegration />} />
         <Route path="settings" element={<Settings />} />

frontend/src/components/CreateContainerModal.tsx

@@ -24,6 +24,7 @@ const defaultForm: CreateContainerRequest = {
   io_speed_mbps: 0,
   extra_ports: [],
   port_mapping_count: 2,
+  snapshot_limit: 3,
   assign_ipv6: false,
   expires_at: '',
 }
@@ -94,7 +95,13 @@ export default function CreateContainerModal({ isOpen, onClose, onSuccess }: Cre
     const containers: CreateContainerRequest[] = []
     for (let i = 0; i < batchCount; i++) {
       const name = batchCount > 1 ? `${boundedForm.name}-${i + 1}` : boundedForm.name
-      containers.push({ ...boundedForm, name, port_mapping_count: Math.max(2, boundedForm.port_mapping_count || 2), extra_ports: [] })
+      containers.push({
+        ...boundedForm,
+        name,
+        port_mapping_count: Math.max(2, boundedForm.port_mapping_count || 2),
+        snapshot_limit: Math.max(1, boundedForm.snapshot_limit || 3),
+        extra_ports: [],
+      })
     }
 
     setLoading(true)
@@ -248,6 +255,15 @@ export default function CreateContainerModal({ isOpen, onClose, onSuccess }: Cre
             </div>
           </Field>
 
+          <Field label="子用户快照上限">
+            <NumberInput
+              value={form.snapshot_limit}
+              min={1}
+              max={999}
+              onChange={(value) => setForm({ ...form, snapshot_limit: Math.max(1, Math.round(value || 1)) })}
+            />
+          </Field>
+
           <Field label="到期时间">
             <div className="relative">
               <CalendarClock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-400" />
@@ -325,6 +341,7 @@ function clampCreateForm(form: CreateContainerRequest, maxVCPU: number, maxRAMMB
     vcpu: clampVCPU(form.vcpu, maxVCPU),
     ram_mb: clampInt(form.ram_mb, 128, maxRAMMB, 512),
     disk_gb: clampInt(form.disk_gb, 1, maxDiskGB, 10),
+    snapshot_limit: clampInt(form.snapshot_limit, 1, undefined, 3),
   }
 }
 

frontend/src/components/Sidebar.tsx

@@ -3,6 +3,7 @@ import {
   ChevronLeft,
   ChevronRight,
   Code2,
+  Camera,
   LayoutDashboard,
   LogOut,
   Package,
@@ -31,6 +32,7 @@ export default function Sidebar({ collapsed, onToggle }: SidebarProps) {
 
   const isImagesPage = location.pathname.startsWith('/images')
   const isOversellPage = location.pathname.startsWith('/oversell')
+  const isSnapshotsPage = location.pathname.startsWith('/snapshots')
   const isAuditLogsPage = location.pathname.startsWith('/audit-logs')
   const isApiIntegrationPage = location.pathname.startsWith('/api-integration')
   const isSecurityPage = location.pathname.startsWith('/security')
@@ -136,6 +138,18 @@ export default function Sidebar({ collapsed, onToggle }: SidebarProps) {
               {!collapsed && <span>安全告警</span>}
             </button>
 
+            <button
+              onClick={() => navigate('/snapshots')}
+              className={`w-full flex items-center gap-3 px-3 py-2.5 rounded-md text-sm transition-colors ${
+                isSnapshotsPage
+                  ? 'bg-black text-white'
+                  : 'text-gray-700 hover:bg-gray-100'
+              }`}
+            >
+              <Camera className="w-4 h-4" />
+              {!collapsed && <span>快照管理</span>}
+            </button>
+
             <button
               onClick={() => navigate('/audit-logs')}
               className={`w-full flex items-center gap-3 px-3 py-2.5 rounded-md text-sm transition-colors ${

frontend/src/pages/ContainerDetail.tsx

@@ -2,6 +2,8 @@ import { useState, useEffect, useCallback, type ReactNode } from 'react'
 import { useParams, useNavigate } from 'react-router-dom'
 import {
   ArrowLeft,
+  Camera,
+  Clock,
   Copy,
   Cpu,
   HardDrive,
@@ -29,9 +31,12 @@ import {
   Container,
   ContainerUsage,
   createSubUser,
+  createContainerSnapshot,
   deleteContainer,
+  deleteContainerSnapshot,
   deletePortMapping,
   getContainer,
+  getContainerSnapshots,
   getContainerUsage,
   getHostInfo,
   getTrafficInfo,
@@ -44,8 +49,13 @@ import {
   restartContainer,
   startContainer,
   stopContainer,
+  Snapshot,
+  SnapshotSchedule,
   Template,
   updateContainerExpiry,
+  updateSnapshotQuota,
+  updateSnapshotSchedule,
+  restoreContainerSnapshot,
   resetTraffic,
   updateTrafficLimit,
   updateResourceLimit,
@@ -125,6 +135,15 @@ export default function ContainerDetail() {
   const [resourceEdit, setResourceEdit] = useState({ vcpu: 1, ramMb: 512, ioMbps: 500, bwMbps: 100 })
   const [savingResource, setSavingResource] = useState(false)
   const [showPassword, setShowPassword] = useState(false)
+  const [showSnapshots, setShowSnapshots] = useState(false)
+  const [snapshots, setSnapshots] = useState<Snapshot[]>([])
+  const [snapshotQuota, setSnapshotQuota] = useState(3)
+  const [snapshotQuotaDraft, setSnapshotQuotaDraft] = useState(3)
+  const [editingSnapshotQuota, setEditingSnapshotQuota] = useState(false)
+  const [snapshotSchedule, setSnapshotSchedule] = useState<SnapshotSchedule | null>(null)
+  const [snapshotBusy, setSnapshotBusy] = useState('')
+  const [showSnapshotSchedule, setShowSnapshotSchedule] = useState(false)
+  const [snapshotScheduleDraft, setSnapshotScheduleDraft] = useState({ intervalHours: 24, time: '03:00' })
 
   const fetchContainer = useCallback(async () => {
     if (!containerIdentifier) return
@@ -142,6 +161,21 @@ export default function ContainerDetail() {
     }
   }, [containerIdentifier, isSubUser])
 
+  const fetchSnapshots = useCallback(async () => {
+    if (!containerIdentifier) return
+    try {
+      const res = await getContainerSnapshots(containerIdentifier)
+      const data = res.data.data
+      const quota = data?.quota || container?.snapshot_limit || 3
+      setSnapshots(data?.snapshots || [])
+      setSnapshotQuota(quota)
+      setSnapshotQuotaDraft(quota)
+      setSnapshotSchedule(data?.schedule || null)
+    } catch (err) {
+      console.error('Failed to fetch snapshots:', err)
+    }
+  }, [containerIdentifier, container?.snapshot_limit])
+
   const appendUsagePoint = useCallback((nextUsage: ContainerUsage, currentContainer: Container | null) => {
     if (!containerIdentifier || !currentContainer) return
 
@@ -198,6 +232,10 @@ export default function ContainerDetail() {
     return () => window.clearInterval(timer)
   }, [fetchUsage])
 
+  useEffect(() => {
+    if (showSnapshots) fetchSnapshots()
+  }, [showSnapshots, fetchSnapshots])
+
   // Poll task status for this container
   useEffect(() => {
     if (!containerIdentifier) return
@@ -478,6 +516,108 @@ export default function ContainerDetail() {
     }
   }
 
+  const handleCreateSnapshot = async () => {
+    if (!containerIdentifier) return
+    if (isSubUser && snapshots.length >= snapshotQuota) {
+      await dialog.alert('快照配额已满', '已达到管理员设置的快照配额，请先删除旧快照。')
+      return
+    }
+    if (container?.status === 'running') {
+      const confirmed = await dialog.confirm(
+        '拍摄快照',
+        `拍摄快照需要先关机，完成后会自动重启容器 ${container.name}。是否继续？`
+      )
+      if (!confirmed) return
+    }
+    setSnapshotBusy('create')
+    try {
+      await createContainerSnapshot(containerIdentifier)
+      await Promise.all([fetchSnapshots(), fetchContainer()])
+    } catch (err: unknown) {
+      const error = err as { response?: { data?: { message?: string } } }
+      await dialog.alert('创建快照失败', error.response?.data?.message || '请稍后重试。')
+    } finally {
+      setSnapshotBusy('')
+    }
+  }
+
+  const openSnapshotSchedule = () => {
+    setSnapshotScheduleDraft({
+      intervalHours: Math.max(snapshotSchedule?.interval_hours || 24, 24),
+      time: snapshotSchedule?.time || '03:00',
+    })
+    setShowSnapshotSchedule(true)
+  }
+
+  const saveSnapshotSchedule = async (enabled: boolean) => {
+    if (!containerIdentifier) return
+    const intervalHours = snapshotScheduleDraft.intervalHours
+    const scheduleTime = snapshotScheduleDraft.time || '03:00'
+    if (enabled && intervalHours < 24) {
+      await dialog.alert('参数错误', '自动快照周期最低是 1 天一次。')
+      return
+    }
+    setSnapshotBusy('schedule')
+    try {
+      await updateSnapshotSchedule(containerIdentifier, enabled, intervalHours, scheduleTime)
+      await Promise.all([fetchSnapshots(), fetchContainer()])
+      setShowSnapshotSchedule(false)
+    } catch (err: unknown) {
+      const error = err as { response?: { data?: { message?: string } } }
+      await dialog.alert('定时快照失败', error.response?.data?.message || '请稍后重试。')
+    } finally {
+      setSnapshotBusy('')
+    }
+  }
+
+  const saveSnapshotQuota = async () => {
+    if (!containerIdentifier || isSubUser) return
+    const nextQuota = Math.max(1, Math.round(snapshotQuotaDraft || 1))
+    setSnapshotBusy('quota')
+    try {
+      await updateSnapshotQuota(containerIdentifier, nextQuota)
+      setSnapshotQuota(nextQuota)
+      setSnapshotQuotaDraft(nextQuota)
+      setEditingSnapshotQuota(false)
+      await Promise.all([fetchSnapshots(), fetchContainer()])
+    } catch (err: unknown) {
+      const error = err as { response?: { data?: { message?: string } } }
+      await dialog.alert('保存快照配额失败', error.response?.data?.message || '请稍后重试。')
+    } finally {
+      setSnapshotBusy('')
+    }
+  }
+
+  const handleDeleteSnapshot = async (snapshot: Snapshot) => {
+    if (!containerIdentifier) return
+    if (!(await dialog.confirm('删除快照', `确定删除 ${snapshot.created_at} 的快照吗？`))) return
+    setSnapshotBusy(snapshot.id)
+    try {
+      await deleteContainerSnapshot(containerIdentifier, snapshot.id)
+      await fetchSnapshots()
+    } catch (err: unknown) {
+      const error = err as { response?: { data?: { message?: string } } }
+      await dialog.alert('删除快照失败', error.response?.data?.message || '请稍后重试。')
+    } finally {
+      setSnapshotBusy('')
+    }
+  }
+
+  const handleRestoreSnapshot = async (snapshot: Snapshot) => {
+    if (!containerIdentifier) return
+    if (!(await dialog.confirm('恢复快照', `确定恢复到 ${snapshot.created_at} 的快照吗？当前容器数据会被覆盖。`))) return
+    setSnapshotBusy(snapshot.id)
+    try {
+      await restoreContainerSnapshot(containerIdentifier, snapshot.id)
+      await Promise.all([fetchSnapshots(), fetchContainer()])
+    } catch (err: unknown) {
+      const error = err as { response?: { data?: { message?: string } } }
+      await dialog.alert('恢复快照失败', error.response?.data?.message || '请稍后重试。')
+    } finally {
+      setSnapshotBusy('')
+    }
+  }
+
   const copyText = async (text: string) => {
     try {
       await copyText(text)
@@ -641,6 +781,10 @@ export default function ContainerDetail() {
                 NAT 管理
               </ActionButton>
             </>
+            <ActionButton onClick={() => setShowSnapshots(true)} disabled={!!taskStatus || !!snapshotBusy}>
+              <Camera className="w-3.5 h-3.5" />
+              快照
+            </ActionButton>
             {!isSubUser && (
               <ActionButton onClick={openReinstall} disabled={!!taskStatus || isExpired}>
                 <RefreshCw className="w-3.5 h-3.5" />
@@ -846,6 +990,171 @@ export default function ContainerDetail() {
         </Modal>
       )}
 
+      {showSnapshots && (
+        <Modal
+          title="快照"
+          onClose={() => {
+            setShowSnapshots(false)
+            setEditingSnapshotQuota(false)
+          }}
+          wide
+          extra={
+            <div className="flex items-center gap-2">
+              <button
+                onClick={openSnapshotSchedule}
+                disabled={!!snapshotBusy}
+                className={`inline-flex items-center gap-1.5 rounded-md px-3 py-1.5 text-xs ${
+                  snapshotSchedule?.enabled
+                    ? 'border border-blue-200 bg-blue-50 text-blue-700 hover:bg-blue-100'
+                    : 'border border-gray-300 text-gray-700 hover:bg-gray-50'
+                } disabled:opacity-50`}
+              >
+                <Clock className="w-3.5 h-3.5" />
+                {snapshotBusy === 'schedule' ? '处理中...' : snapshotSchedule?.enabled ? '定时设置' : '定时快照'}
+              </button>
+              <button
+                onClick={handleCreateSnapshot}
+                disabled={!!snapshotBusy || (isSubUser && snapshots.length >= snapshotQuota)}
+                className="inline-flex items-center gap-1.5 rounded-md bg-black px-3 py-1.5 text-xs text-white hover:bg-gray-800 disabled:opacity-50"
+              >
+                <Camera className="w-3.5 h-3.5" />
+                {snapshotBusy === 'create' ? '创建中...' : '新建快照'}
+              </button>
+            </div>
+          }
+        >
+          <div className="space-y-4">
+            <div className="flex flex-wrap items-center justify-between gap-3 rounded-lg border border-gray-200 bg-gray-50 px-4 py-3 text-xs text-gray-600">
+              <div>
+                快照数量：
+                <span className="font-mono text-gray-900">
+                  {snapshots.length}
+                </span>
+              </div>
+              <div className="flex items-center gap-2">
+                <span>子用户配额：</span>
+                <span className="font-mono text-gray-900">{snapshotQuota}</span>
+                {!isSubUser && (
+                  <button
+                    onClick={() => {
+                      setSnapshotQuotaDraft(snapshotQuota)
+                      setEditingSnapshotQuota((value) => !value)
+                    }}
+                    className="inline-flex items-center gap-1 rounded border border-gray-300 bg-white px-2 py-1 text-[11px] text-gray-700 hover:bg-gray-50"
+                    disabled={snapshotBusy === 'quota'}
+                  >
+                    <Pencil className="w-3 h-3" />
+                    修改
+                  </button>
+                )}
+              </div>
+              <div>
+                定时状态：
+                <span className="text-gray-900">
+                  {snapshotSchedule?.enabled ? `已开启，每 ${formatScheduleInterval(snapshotSchedule.interval_hours || 24)}，${snapshotSchedule.time || '03:00'} 执行` : '未开启'}
+                </span>
+              </div>
+              {snapshotSchedule?.next_run && (
+                <div>下次执行：<span className="font-mono text-gray-900">{formatDateTime(snapshotSchedule.next_run)}</span></div>
+              )}
+            </div>
+
+            {editingSnapshotQuota && !isSubUser && (
+              <div className="flex flex-wrap items-end gap-3 rounded-lg border border-gray-200 bg-white px-4 py-3">
+                <Field label="子用户每台容器快照上限">
+                  <input
+                    type="number"
+                    min={1}
+                    max={999}
+                    value={snapshotQuotaDraft}
+                    onChange={(event) => setSnapshotQuotaDraft(Math.max(1, Math.round(Number(event.target.value) || 1)))}
+                    className="w-44 px-3 py-2 border border-gray-300 rounded-md text-sm text-black bg-white focus:outline-none focus:ring-2 focus:ring-black focus:border-black"
+                  />
+                </Field>
+                <div className="flex gap-2 pb-0.5">
+                  <button
+                    onClick={() => {
+                      setEditingSnapshotQuota(false)
+                      setSnapshotQuotaDraft(snapshotQuota)
+                    }}
+                    className="px-3 py-2 text-sm text-gray-700 hover:bg-gray-100 rounded-md"
+                    disabled={snapshotBusy === 'quota'}
+                  >
+                    取消
+                  </button>
+                  <button
+                    onClick={saveSnapshotQuota}
+                    disabled={snapshotBusy === 'quota'}
+                    className="inline-flex items-center gap-1.5 px-3 py-2 text-sm bg-black text-white rounded-md hover:bg-gray-800 disabled:opacity-50"
+                  >
+                    <Save className="w-4 h-4" />
+                    {snapshotBusy === 'quota' ? '保存中...' : '保存'}
+                  </button>
+                </div>
+              </div>
+            )}
+
+            <SnapshotTable
+              snapshots={snapshots}
+              busy={snapshotBusy}
+              onRestore={handleRestoreSnapshot}
+              onDelete={handleDeleteSnapshot}
+            />
+          </div>
+        </Modal>
+      )}
+
+      {showSnapshotSchedule && (
+        <Modal title="定时快照" onClose={() => setShowSnapshotSchedule(false)}>
+          <div className="space-y-4">
+            <Field label="自动快照周期">
+              <select
+                value={snapshotScheduleDraft.intervalHours}
+                onChange={(e) => setSnapshotScheduleDraft({ ...snapshotScheduleDraft, intervalHours: Number(e.target.value) })}
+                className={inputClass}
+              >
+                <option value={24}>1 天</option>
+                <option value={72}>3 天</option>
+                <option value={168}>7 天</option>
+                <option value={336}>14 天</option>
+              </select>
+            </Field>
+            <Field label="执行时间">
+              <input
+                type="time"
+                value={snapshotScheduleDraft.time}
+                onChange={(e) => setSnapshotScheduleDraft({ ...snapshotScheduleDraft, time: e.target.value || '03:00' })}
+                className={inputClass}
+              />
+            </Field>
+            <div className="rounded-md border border-gray-200 bg-gray-50 px-3 py-2 text-xs text-gray-500">
+              {`每 ${formatScheduleInterval(snapshotScheduleDraft.intervalHours)} 在 ${snapshotScheduleDraft.time || '03:00'} 执行。`}
+            </div>
+            <div className="flex justify-between gap-3 pt-2">
+              {snapshotSchedule?.enabled ? (
+                <button
+                  onClick={() => saveSnapshotSchedule(false)}
+                  disabled={snapshotBusy === 'schedule'}
+                  className="px-4 py-2 text-sm text-red-600 border border-red-200 rounded-md hover:bg-red-50 disabled:opacity-50"
+                >
+                  关闭定时
+                </button>
+              ) : <div />}
+              <div className="flex gap-2">
+                <button onClick={() => setShowSnapshotSchedule(false)} className="px-4 py-2 text-sm text-gray-700 hover:bg-gray-100 rounded-md">取消</button>
+                <button
+                  onClick={() => saveSnapshotSchedule(true)}
+                  disabled={snapshotBusy === 'schedule'}
+                  className="px-4 py-2 text-sm bg-black text-white rounded-md hover:bg-gray-800 disabled:opacity-50"
+                >
+                  {snapshotBusy === 'schedule' ? '保存中...' : '保存'}
+                </button>
+              </div>
+            </div>
+          </div>
+        </Modal>
+      )}
+
       {showNat && (
         <Modal title="NAT 端口管理" onClose={() => { setShowNat(false); setDraft(emptyDraft); setShowNatAdd(false) }} wide extra={
           !isSubUser && canAddMapping && !showNatAdd && (
@@ -1229,6 +1538,65 @@ function PlainRow({ label, value, mono = false, copyValue, onCopy, children }: {
   )
 }
 
+function SnapshotTable({ snapshots, busy, onRestore, onDelete }: {
+  snapshots: Snapshot[]
+  busy: string
+  onRestore: (snapshot: Snapshot) => void
+  onDelete: (snapshot: Snapshot) => void
+}) {
+  if (snapshots.length === 0) {
+    return <p className="rounded-lg border border-dashed border-gray-200 px-4 py-8 text-center text-sm text-gray-400">暂无快照</p>
+  }
+
+  return (
+    <div className="overflow-x-auto rounded-lg border border-gray-200">
+      <table className="w-full min-w-[760px] text-sm">
+        <thead className="border-b border-gray-200 bg-gray-50 text-xs text-gray-500">
+          <tr>
+            <TableHead>快照时间</TableHead>
+            <TableHead>类型</TableHead>
+            <TableHead>创建者</TableHead>
+            <TableHead>大小</TableHead>
+            <th className="px-3 py-2 text-right text-xs font-medium text-gray-500">操作</th>
+          </tr>
+        </thead>
+        <tbody className="divide-y divide-gray-100">
+          {snapshots.map((snapshot) => (
+            <tr key={snapshot.id}>
+              <td className="px-3 py-2 font-mono text-xs text-gray-800">{snapshot.created_at}</td>
+              <td className="px-3 py-2">
+                <span className={`rounded px-2 py-1 text-xs ${snapshot.scheduled ? 'bg-blue-50 text-blue-700' : 'bg-gray-100 text-gray-700'}`}>
+                  {snapshot.scheduled ? '定时' : '手动'}
+                </span>
+              </td>
+              <td className="px-3 py-2 text-xs text-gray-600">{snapshot.created_by || '-'}</td>
+              <td className="px-3 py-2 font-mono text-xs text-gray-600">{formatBytes(snapshot.size_bytes || 0)}</td>
+              <td className="px-3 py-2">
+                <div className="flex justify-end gap-1.5">
+                  <button
+                    onClick={() => onRestore(snapshot)}
+                    disabled={!!busy}
+                    className="rounded border border-gray-300 px-2.5 py-1 text-xs text-gray-700 hover:bg-gray-50 disabled:opacity-50"
+                  >
+                    {busy === snapshot.id ? '处理中...' : '恢复'}
+                  </button>
+                  <button
+                    onClick={() => onDelete(snapshot)}
+                    disabled={!!busy}
+                    className="rounded border border-red-200 px-2.5 py-1 text-xs text-red-600 hover:bg-red-50 disabled:opacity-50"
+                  >
+                    删除
+                  </button>
+                </div>
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  )
+}
+
 function MappingTable({ mappings, publicHost, onEdit, onDelete, compact = false, isSubUser = false }: { mappings: PortMapping[]; publicHost: string; onEdit: (pm: PortMapping, index: number) => void; onDelete: (index: number) => void; compact?: boolean; isSubUser?: boolean }) {
   if (mappings.length === 0) {
     return <p className="text-sm text-gray-400">暂无端口映射</p>
@@ -1389,6 +1757,19 @@ function formatExpiration(value?: string): string {
   return value.length >= 10 ? value.slice(0, 10) : value
 }
 
+function formatDateTime(value?: string): string {
+  if (!value) return '-'
+  const parsed = new Date(value)
+  if (Number.isNaN(parsed.getTime())) return value
+  return parsed.toLocaleString()
+}
+
+function formatScheduleInterval(hours: number): string {
+  if (hours === 24) return '1 天'
+  if (hours % 24 === 0) return `${hours / 24} 天`
+  return `${hours} 小时`
+}
+
 function formatRate(bytesPerSecond: number): string {
   if (bytesPerSecond < 1024) return `${bytesPerSecond.toFixed(0)} B/s`
   if (bytesPerSecond < 1024 * 1024) return `${(bytesPerSecond / 1024).toFixed(1)} KB/s`

frontend/src/pages/Containers.tsx

@@ -538,8 +538,15 @@ function toPlaceholder(cfg: CreateContainerRequest): DisplayContainer {
     ssh_password: '',
     port_mappings: [],
     port_mapping_limit: 2,
+    snapshot_limit: cfg.snapshot_limit || 3,
     created_at: '',
     expires_at: cfg.expires_at,
+    snapshot_schedule_enabled: false,
+    snapshot_schedule_interval_hours: 24,
+    snapshot_schedule_time: '03:00',
+    snapshot_schedule_last_run: '',
+    snapshot_schedule_next_run: '',
+    snapshot_schedule_created_by: '',
     isPlaceholder: true,
   }
 }

frontend/src/pages/Snapshots.tsx

@@ -0,0 +1,108 @@
+import { useCallback, useEffect, useState } from 'react'
+import { Camera, RefreshCw, Server } from 'lucide-react'
+import { useNavigate } from 'react-router-dom'
+import { getSnapshots, Snapshot } from '../services/api'
+
+export default function Snapshots() {
+  const navigate = useNavigate()
+  const [snapshots, setSnapshots] = useState<Snapshot[]>([])
+  const [loading, setLoading] = useState(true)
+  const [refreshing, setRefreshing] = useState(false)
+
+  const fetchData = useCallback(async () => {
+    try {
+      const res = await getSnapshots()
+      setSnapshots(res.data.data || [])
+    } catch (err) {
+      console.error(err)
+    } finally {
+      setLoading(false)
+      setRefreshing(false)
+    }
+  }, [])
+
+  useEffect(() => { fetchData() }, [fetchData])
+
+  if (loading) {
+    return (
+      <div className="flex items-center justify-center py-20">
+        <div className="h-8 w-8 animate-spin rounded-full border-b-2 border-black" />
+      </div>
+    )
+  }
+
+  return (
+    <div className="space-y-5">
+      <div className="flex items-center justify-between gap-4">
+        <div>
+          <h1 className="text-xl font-semibold text-black">快照管理</h1>
+          <p className="mt-1 text-sm text-gray-500">全局快照列表，共 {snapshots.length} 个</p>
+        </div>
+        <button
+          onClick={() => { setRefreshing(true); fetchData() }}
+          disabled={refreshing}
+          className="inline-flex items-center gap-2 rounded-md border border-gray-300 px-3 py-2 text-sm text-gray-700 hover:bg-gray-50 disabled:opacity-50"
+        >
+          <RefreshCw className={`h-4 w-4 ${refreshing ? 'animate-spin' : ''}`} />
+          刷新
+        </button>
+      </div>
+
+      <div className="overflow-hidden rounded-lg border border-gray-200 bg-white">
+        {snapshots.length === 0 ? (
+          <div className="flex flex-col items-center justify-center px-6 py-16 text-center">
+            <div className="mb-4 flex h-14 w-14 items-center justify-center rounded-lg bg-gray-100">
+              <Camera className="h-7 w-7 text-gray-400" />
+            </div>
+            <div className="text-sm font-medium text-gray-700">暂无快照</div>
+          </div>
+        ) : (
+          <table className="w-full min-w-[820px] text-sm">
+            <thead className="border-b border-gray-200 bg-gray-50 text-xs text-gray-500">
+              <tr>
+                <th className="px-4 py-3 text-left font-medium">容器</th>
+                <th className="px-4 py-3 text-left font-medium">LXC 名称</th>
+                <th className="px-4 py-3 text-left font-medium">快照时间</th>
+                <th className="px-4 py-3 text-left font-medium">类型</th>
+                <th className="px-4 py-3 text-left font-medium">创建者</th>
+                <th className="px-4 py-3 text-right font-medium">大小</th>
+              </tr>
+            </thead>
+            <tbody className="divide-y divide-gray-100">
+              {snapshots.map((snapshot) => (
+                <tr key={snapshot.id} className="hover:bg-gray-50">
+                  <td className="px-4 py-3">
+                    <button
+                      onClick={() => navigate(`/container/${snapshot.container_id}`)}
+                      className="inline-flex items-center gap-2 text-left font-medium text-black hover:underline"
+                    >
+                      <Server className="h-4 w-4 text-gray-400" />
+                      {snapshot.container_name}
+                    </button>
+                  </td>
+                  <td className="px-4 py-3 font-mono text-xs text-gray-600">{snapshot.lxc_name}</td>
+                  <td className="px-4 py-3 text-gray-700">{snapshot.created_at}</td>
+                  <td className="px-4 py-3">
+                    <span className={`rounded px-2 py-1 text-xs ${snapshot.scheduled ? 'bg-blue-50 text-blue-700' : 'bg-gray-100 text-gray-700'}`}>
+                      {snapshot.scheduled ? '定时' : '手动'}
+                    </span>
+                  </td>
+                  <td className="px-4 py-3 text-gray-600">{snapshot.created_by || '-'}</td>
+                  <td className="px-4 py-3 text-right font-mono text-xs text-gray-600">{formatBytes(snapshot.size_bytes || 0)}</td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        )}
+      </div>
+    </div>
+  )
+}
+
+function formatBytes(bytes: number): string {
+  if (!bytes) return '-'
+  if (bytes < 1024) return `${bytes} B`
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
+  if (bytes < 1024 * 1024 * 1024) return `${(bytes / 1024 / 1024).toFixed(1)} MB`
+  return `${(bytes / 1024 / 1024 / 1024).toFixed(1)} GB`
+}

frontend/src/services/api.ts

@@ -71,8 +71,15 @@ export interface Container {
   ssh_password: string
   port_mappings: PortMapping[]
   port_mapping_limit: number
+  snapshot_limit: number
   created_at: string
   expires_at: string
+  snapshot_schedule_enabled: boolean
+  snapshot_schedule_interval_hours: number
+  snapshot_schedule_time: string
+  snapshot_schedule_last_run: string
+  snapshot_schedule_next_run: string
+  snapshot_schedule_created_by: string
 }
 
 export interface Template {
@@ -100,6 +107,7 @@ export interface CreateContainerRequest {
   io_speed_mbps: number
   extra_ports: number[]
   port_mapping_count: number
+  snapshot_limit: number
   assign_ipv6: boolean
   expires_at: string
 }
@@ -354,6 +362,62 @@ export const getOversellStatus = () =>
 export const reclaimMemory = () =>
   api.post<APIResponse<ReclaimResult>>('/oversell/reclaim')
 
+// Snapshots
+export interface Snapshot {
+  id: string
+  container_id: number
+  container_name: string
+  lxc_name: string
+  created_at: string
+  created_by: string
+  scheduled: boolean
+  path: string
+  size_bytes: number
+}
+
+export interface SnapshotSchedule {
+  enabled: boolean
+  interval_hours: number
+  time: string
+  last_run: string
+  next_run: string
+  created_by: string
+}
+
+export interface ContainerSnapshotsResponse {
+  snapshots: Snapshot[]
+  quota: number
+  schedule: SnapshotSchedule
+}
+
+export const getSnapshots = () =>
+  api.get<APIResponse<Snapshot[]>>('/snapshots')
+
+export const getContainerSnapshots = (id: ContainerIdentifier) =>
+  api.get<APIResponse<ContainerSnapshotsResponse>>(`/containers/${id}/snapshots`)
+
+export const createContainerSnapshot = (id: ContainerIdentifier) =>
+  api.post<APIResponse<Snapshot>>(`/containers/${id}/snapshots`, {}, { timeout: 600000 })
+
+export const deleteContainerSnapshot = (id: ContainerIdentifier, snapshotId: string) =>
+  api.delete<APIResponse>(`/containers/${id}/snapshots/${snapshotId}`, { timeout: 600000 })
+
+export const restoreContainerSnapshot = (id: ContainerIdentifier, snapshotId: string) =>
+  api.post<APIResponse>(`/containers/${id}/snapshots/${snapshotId}/restore`, {}, { timeout: 600000 })
+
+export const updateSnapshotSchedule = (id: ContainerIdentifier, enabled: boolean, intervalHours: number, time: string) =>
+  api.post<APIResponse<{ container: Container; snapshot?: Snapshot }>>(
+    `/containers/${id}/snapshots/schedule`,
+    { enabled, interval_hours: intervalHours, time },
+    { timeout: 600000 }
+  )
+
+export const updateSnapshotQuota = (id: ContainerIdentifier, snapshotLimit: number) =>
+  api.put<APIResponse<{ container: Container; quota: number }>>(
+    `/containers/${id}/snapshots/quota`,
+    { snapshot_limit: snapshotLimit }
+  )
+
 // WebSSH URL generator
 export const getWebSSHUrl = (containerName: string) => {
   const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:'