Plesk 8.2.0 backup

Probleme mit Plesk scheduled ftp backup

Hallo an alle, seit dem ich das Plesk Backup über die Pleskoberfläche von lokaler Sicherung auf FTP umgestellt habe bekomme ich bei manchen Kunden-Backups folgende Fehlermeldung:

Following error is occured during scheduled backup process:

Error in UploadToRepositoryState.doActivityRunner()
Traceback (most recent call last):
File "/usr/local/psa/admin/share/agent_runner/agent_runner.py", line 98, in doActivityRunner
newState = self.doActivity()
File "/usr/local/psa/admin/share/agent_runner/agent_runner.py", line 427, in doActivity
remotefh = remoteBackupFile.fh('wb')
File "/usr/local/psa/admin/lib/python/backup.py", line 360, in fh
self.file = self.ftp.file(self.filename, mode)
File "/usr/local/psa/admin/lib/python/ftputil/ftputil.py", line 226, in file
host = self._copy()
File "/usr/local/psa/admin/lib/python/ftputil/ftputil.py", line 202, in _copy
return FTPHost(*self._args, self._kwargs)
File "/usr/local/psa/admin/lib/python/ftputil/ftputil.py", line 141, in __init__
self._session = self._make_session()
File "/usr/local/psa/admin/lib/python/ftputil/ftputil.py", line 196, in _make_session
return ftp_error._try_with_oserror(factory, *args, kwargs)
File "/usr/local/psa/admin/lib/python/ftputil/ftp_error.py", line 85, in _try_with_oserror
raise PermanentError(obj)
PermanentError: 530 Sorry, the maximum number of clients (3) for this user are already connected.
Debugging info: ftputil 2.1.1, Python 2.4.1 (linux2)

Plesk Version: psa v8.2.0_build82070807.17 os_SuSE 10.0
Server bei Strato mit 80GB FTP Backupspace

Kann mir jemand dazu etwas sagen an was es liegen könnte?