Re:External and Online (Score 2, Informative)

I have a pair of external FW800 drives in a software RAID-1 configuration. Every month I bring one of them home from the office, remirror, break the mirror again and take it back to the office.

If I have a total system loss (fire, theft, etc.) I'm worst case 1 month out of date.

My very critical data that I can't tolerate a 1 month loss of, I use online backup (http://www.tarsnap.com)