Backup Exec Alert: Job Cancellation
(Server: "servername") (Job: "Daily") 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.
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When a job does not start before the time window expires, it is automatically canceled.
This can also be logged when you manually cancel a job.
Happened for me because my backups grew larger than the tapes. I had an auto-response for Alert for Library Media Insert to dismiss after 2 hours.
So for me, tapes would fill up, and alert for a new tape would fire and two hours later the job was automatically cancelled.