I lost all my college work on disk last time (sentimental value really though), I have very little of it left on paper.
All my business stuff is on the computer, as well as all the usual stuff. I'd be gutted if I lost it.
I need some of it on my laptop all the time anyway, so it has a functional use rather than just backup there. On my server it has been handy as I can download a document remotely.