Symptoms
A backup cannot be restored in Plesk
Archive error: Unable to extract files from /var/lib/psa/dumps/domains/example.com/backup_user-data_1805242210.tar to /var/www/vhosts/example.com: /bin/tar: httpdocs/administrator/backups/index.html: Cannot open: File exists
/bin/tar: httpdocs/administrator/cache/index.html: Cannot open: File exists
/bin/tar: httpdocs/administrator/components/com_admin/admin.admin.php: Cannot open: File exists
/bin/tar: httpdocs/administrator/components/com_admin/index.html: Cannot open: File exists
/bin/tar: httpdocs/administrator/components/com_admin/admin.admin.html.php: Cannot open: File exists
/bin/tar: httpdocs/administrator/components/com_admin/toolbar.admin.php: Cannot open: File exists
Archive error: Unable to extract files from /var/lib/psa/dumps/domains/example.com/backup_user-data_1805242210.tar to /var/www/vhosts/example.com: /bin/tar: /var/lib/psa/dumps/: Permission denied
/bin/tar: Error is not recoverable: exiting now
Cause
Backup Manager can't restore these files because their permissions don't allow the owner to create files.
Resolution
Restore the backup using the command-line.
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Connect to the server over SSH
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Restore the backup from the corresponding archive:
# set +v | tar -f /var/lib/psa/dumps/domains/example.com/backup_user-data_1805242210.tar -xvm --same-permissions --same-owner -C /var/www/vhosts/example.com --wildcards --anchored