+1 from me. We're having this same issue. I'm going to exclude those two folders from our nightly backup to avoid this ballooning backup size... No settings at all to control this behavior.

Stranger still, it doesn't seem to run on any set schedule... 8:15 AM, 3:30 PM, etc. Anyone know what is running this backup, a random workstation in the office? Does the backup happen when new updates are downloaded or installed or something?