I have 4 1TB SATA hard drives. I want to do some data backup, so mirroring is a must. (You would want to backup too if you just spent $1500 on recovering data from a 750GB that you dropped which contained pretty much the only copy of all your work for the past 10 years. ) So, I am thinking, there are a couple options. Would you: (btw - sorry, but I don't know the Raid numbering scheme.) a. Create a Raid in which I do a stripe across 2 drives, and then mirror that, ending up with somewhere around 1.7 TB of space, but high band-width. b. Create 2 separate mirrored raid disks sets. c. (Insert your opinion here.) Thanks all.