Our company is using Sage 50 Quantum Accounting 2019, and, for whatever reason, our largest company is consistently failing to produce a ptb file through automated backup.  All of our other companies can successfully backup, but automated backup for our largest company (the one we'd really like to have a scheduled backup of) results in a DotNetZip-*.tmp file (obviously, a failed backup.) The backup logs only state that the backup was started at the scheduled time, but doesn't list any errors. We can manually backup this company and successfully get a ptb file, but it seems to fail every attempt at automated backup.

What could be causing this? And what's the solution?