Backup not executed as per schedule in DP 9.09.
Saw below error in Data protector Event logs. Restarted the skipped backup and it completed without any issue.
[138:726] CsaStartSession failed for datalist "Backup_spec"
Backup could not be started because CsaStartSession function failed.
* Restart the backup.
* Try running datalist with omnib -session <datalist_name>