This doesn't really answer the question but I'm a fan of Mozy for off-site backup.
- Unlike Dropbox (which I do like too for sharing/syncing files), your files can be in any combination of directories.
- Backups happens automatically in the background so you don't need to think about it
- Backups are incremental - only changed files need to get sent
- Like Dropbox, Mozy stores previous versions (up to a month?) so you're not in trouble even if you "backed up" files after they went wonky.
- Your data will be encrypted with your own key (generated within Mozy client upon install) before it is sent over the wire, and you can optionally store this key with Mozy for safekeeping if you trust them enough and are afraid of losing your key.
- And unlike the homebrew approach of copying files to another machine at home, your backups are truly off-site.
