Well after the site hack occurred, my wife and I had a chat about what would happen if we lost all the data from the forum. We came to the conclusion that if that did happen and we couldn't restore a backup, then the most important resource would still be here: you guys and gals.
On the subject of backups, downloading a full backup of the site is quite prohibitive - it's about 2Gb per backup and the site's bandwidth for each month is 55Gb (and we top 50Gb nearly every month any how). The site is backed up weekly by the ISP and I've decided to take my own backup once a month now too.