SymptomsParallels Plesk Panel sends notifications about failed backup every 30 minutes. Option send mail notification was specified for the backup.
Recipient constantly receives the same notification about old backup which was already completed, but with the error.
ResolutionHotfix is available and can be applied on the server with Parallels Plesk Panel 9.5.x.
For hotfix installation replace the file %plesk_dir%\admin\share\pmmcli\pmmcli_daemon_actions.py with the file from the attachment.
After hotfix installation backup notification will send only once.
Create a copy of original file before applying fix.