My cabinet is running DOS, so I don't have to worry about OS crashing or registry corruption. I am, however, worried about hard disk failure. My company just junked a perfectly good 5 GB tape backup drive, and I just located its DOS software, so I'm going to install that and just back up the drives to tape. Once I get a spare 4 GB hard disk, I'll probably get rid of the tape backup and just ghost onto the spare periodically.
--Chris