Cannot restore domain from Plesk backup: Cannot open: Permission denied

Symptoms

Cannot restore domain in Plesk:

PLESK_ERROR: Error:
Archive error: from /var/lib/psa/dumps/clients/client_name/domains/example.com/client_name_example.com_mn_1310160418.tgz to /var/qmail/mailnames/example.com:
tar (child): /var/lib/psa/dumps/clients/client_name/domains/example.com/client_name_example.com_mn_1310160418.tgz: Cannot open: Permission denied
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

Cause

Incorrect permissions on directories, sub-directories or files in
/var/lib/psa/dumps.

Resolution

1. Connect to Plesk server via SSH. 
2. Repair file permissions for the domain:

   # plesk repair fs -y