Can not restore Domain after reinstall

[Netz]

Hello!

Here my problem:
I had to reinstall my rootserver (linux 9.3 with Plesk 7.5). I was hosting three domains which were backed up every night. The backup files werde transfered to my ftp backup server.

Now, after the reinstall I wanted to restore the Domains in Plesk. That did not work. I got this message:
Unable to restore file: Error: domain_bu: Signature verification failed for /var/lib/pasa/dumps/my_domain/backup_file
Dump signature verification failed for /var/lib/pasa/dumps/my_domain/backup_file

Ok, I knew this was a known problem, so I tried to restore the domain with the "--single-domain-mode" parameter in my console. That did not work either! Here the message:

===============================================================================

Attempt to connect to MySQL server ... done

===============================================================================

Checking packages installation ... done

===============================================================================

Dump reader error: Unable to open input file "backup_file"


Kann anyone PLEASE help me? I really need these domains!

Thanks