I did not know RAID was that fragile I have no experience with it but the way it was talked about when I went to school was you get a disk failure you just slap in a new on and it fixes itself with no down time.

I can totally believe that this is not true but I am wondering what do people use to back up multiple terabytes of stuff? Just more hard drives? I only backup pictures and documents and I just put them online and hope I don't lose the local copy and online copy at the same time :)but if I had to I could fit all of it on DVD's.