Hey, it's there, it's paid for, I might as well have it turned on. ;-)
It's mainly TimeMachine backups for our Macs, though there are lots of photos from our various cameras as well.
The DS214 is full and ungodly slow in its present state, so I have decided to finally decommission it and add a couple more 12 GB drives to the 918 so I won't have to worry about it for a while. 5+ years out of 2x4 GB on the DS214 with no issues, so I'm pretty happy.
Cheers,
Scott.