Backup job stops running

Backup job stops running

We're using 8200 Enterprise on Server 2008 R2. We've noticed this on several occassions, but the backup job will just stop working. We noticed today our last backup occurred on May 6, and the next scheduled time was May 7. However, the backup job never ran and hasn't since May 6. We configured an email address on a failure, but we haven't received any emails. What causes this? We had this happen on a few occasions when we were using 8.1. I appreciate any help/feedback on this.

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