Some more interesting information is had in
this article about the virtues of SoftRAID vs. OS X RAID.
I've got backup to my backup. Call me paranoid if you like, but I hate standing there looking like a horse's tail end and crying about lost data and irreplaceable applications because I didn't do some simple housekeeping.
Add me to the "tri-backup" team (the wife hates all my hard drives.... sees money spent, I guess....).
I also keep 'hard copy" DVD of archived data, and all photos and audio. It only takes losing some important data once to underscore the importance of backup. In my case, it was a near miss (was able to scavenge the SCSI drive), but it scared the bejeebers outta' me...... 🙂