Full and Differential System State Backup going to disk followed by duplicate to tape.
Duplicate backup to tape of differential disk backup will fail with error mentioned below if retention of differential backup to disk is set in a way that the first backup set has already expired and deleted by DLM.
Completed status: Canceled
The job was canceled because the response to a media request alert was Cancel, or because the alert was configured to automatically respond with Cancel, or because the Backup Exec Job Engine service was stopped.
This issue is resolved in Backup Exec 2014 or later versions.
To resolve this issue and receive the new Backup Exec improvements please upgrade to the current version of Backup Exec.
NOTE: Symantec continues to focus on the current release and future releases, there are no plans to address this issue by way of a patch or hotfix in earlier versions of the software at the present time. Please contact your Symantec Sales representative or the Symantec Partner for upgrade information including upgrade eligibility to the release containing the resolution for this issue. For information on how to contact Symantec Sales, please see http://www.symantec.com
Workaround (for BE 2012):
Increase the retention of differential System State backup to disk in a way that all differential backup sets are available till all the backups in the backup cycle has completed.