backup can now be stopped

track the backup process and killable

src/routes/sysadmin.js

@@ -26,7 +26,7 @@ function backup(req, res, next) {
     // note that cloudron.backup only waits for backup initiation and not for backup to complete
     // backup progress can be checked up ny polling the progress api call
     var auditSource = { userId: null, username: 'sysadmin' };
-    backups.runBackupTask(auditSource, function (error) {
+    backups.startBackupTask(auditSource, function (error) {
         if (error && error.reason === BackupsError.BAD_STATE) return next(new HttpError(409, error.message));
         if (error) return next(new HttpError(500, error));