fix: 快照时排除备份目录下的快照文件 (#3926)

Refs #3923

backend/app/service/snapshot_create.go

@@ -121,7 +121,7 @@ func snapBackup(snap snapHelper, localDir, targetDir string) {
 	defer snap.Wg.Done()
 	_ = snapshotRepo.UpdateStatus(snap.Status.ID, map[string]interface{}{"backup_data": constant.Running})
 	status := constant.StatusDone
-	if err := handleSnapTar(localDir, targetDir, "1panel_backup.tar.gz", "./system;"); err != nil {
+	if err := handleSnapTar(localDir, targetDir, "1panel_backup.tar.gz", "./system;./system_snapshot;"); err != nil {
 		status = err.Error()
 	}
 	snap.Status.BackupData = status