Plesk 12.5.30 - restore Backup fail

Hi there,

having PLESK 12.5.30 Update #27, zuletzt aktualisiert: 30. März 2016 00:20:33 on ‪Ubuntu 14.04.4 LTS‬ and a serious problem.

Set Server to "Factory Defaults" (Strato) and wanted to restore my Backups (7 Wordpress Websites) !!!
Unfortunatelly to no avail ...
So I cant get the server running ...
Any help is urgently and much appreciated
Cheers,
Boris