Scheduled backup does not run. Task is presented in the crontab. If you run
backupmng you can see the following error:
backupmng: Unable to fetch backup tasks from database: BIGINT UNSIGNED value is out of range in '(-(weekday(`psa`.`BackupsScheduled`.`last`)) + `psa`.`BackupsScheduled`.`backup_day`)'
Mysql version 5.5 is installed.
MySQL 5.5 is not supported by Plesk 9.5.4. Issue is completely fixed in Parallels Plesk Panel 11.5
Upgrade to Parallels Plesk Panel 11.5.
To make it run on Parallels Plesk Panel 9.5.x make backup using
/usr/local/psa/bin/pleskbackup or downgrade MySQL server version till supported version.