Backing up

I've just told my home server to backup all of my documents and photos. In amongst all those files are my stories, some finished, some being edited, some half written and some storyboarding from new ideas. If I lost any of it I would be devestated. Even if you onlybackup onto a USB stick then, providing you don't use that stick for anything else, it should give you the insurance necessary should your main pc/laptop have a sudden memory loss. So, who doesn't backup, and why?

Shiraz