SymptomsParallels Plesk Panel users are unable to create the full-server backup or the backup of a specific subscription fail with the error "Unable to dump site applications on steapp.loc".
CauseWhen the detail level of the Parallels Plesk Panel debug logs is high, the constant writing of the debug information prevents the successful completion of backups.
The problem will be resolved in the future releases.
The temporary solution is to disable the Panel debug output. For this, open %plesk_dir%\admin\conf\panel.ini and find the lines like the following:
priority = 7
Change the priority value to 3 or completely remove it.