Upgraded to 8 (NE) a few weeks ago, and noticed our disk usage increasing substantially. Turns out that our old backups are not being purged. In "7", I believe there was an entry in cron (something to the effect of purging at a particular # of days). In 8, there appears to be no such opportunity. The admin allows me to set a % (or amount) to keep free, but I've set it 20 times, and it never "sticks". That is, if I immediately look at the parameter again, it has reset to 0.

I've searched the forums high & low (and the 8 admin guide as well).

What are my options?