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I email the latest version to myself at a Google address each time I change something, and keep a copy on a keyring memory stick that goes with me when I go out. There's also a copy on the external hard disk that keeps all my other backups, that's never more than a couple of days old. I think I'd be very unlucky if all of those failed at the same time.
For anything that's already finished and published I don't really see the point. If you had to you could just buy a new copy, whether it's an ebook or a real book.
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