SBS 2008 SP1 on a 80gb partition. notmally has 29gb free space.
Server has started to run extreemly slow. Noticed one day that the C: was completely full. (and I mean completely full with 0mb of free space)
After cleaning my drawers :>) started frantically trying to make a little room, but it was using it up as soon as I'd free up some space. Drove out onsite, about an hour away, and in that time the free space was back to normal.... but the server is still slower than usuall.
Since then I have been watching the server more closely, and see that the free space swings from 29gb to 10gb randomly throughout the day and night. Luckly I have not seen a 0mb day.
Windows backups have started failing too add to the problem.