fix: make sure backups are correctly sorted for clean up

server/src/services/backup.service.ts

@@ -56,7 +56,10 @@ export class BackupService extends BaseService {
 
     const backupsFolder = StorageCore.getBaseFolder(StorageFolder.Backups);
     const files = await this.storageRepository.readdir(backupsFolder);
-    const backups = files.filter((fn) => isValidRoutineBackupName(fn));
+    const backups = files
+      .filter((fn) => isValidRoutineBackupName(fn))
+      .toSorted()
+      .toReversed();
     const failedBackups = files.filter((fn) => isFailedBackupName(fn));
 
     const toDelete = backups.slice(config.keepLastAmount);

server/src/services/maintenance.service.spec.ts

@@ -151,7 +151,6 @@ describe(MaintenanceService.name, () => {
           'immich-db-backup-20250727T110116-v1.234.5-pg14.5.sql.gz',
           'immich-db-backup-1753789649000.sql.gz',
         ],
-        failedBackups: ['immich-db-backup-20250725T110216-v1.234.5-pg14.5.sql.gz.tmp'],
       });
     });
   });