I have 2 1TB drives coming in on Monday, and I plan to put them in a mirror RAID using Disk Utility. How reliable is the OS X software RAID setup? Would I be better to just manually backup from one drive to another? The drives will be for my photography, I wanted a mirror setup so I'd finally have a backup of my (current) 250GB's of photos. (Most of which I could probably burn to DVD's but humor me.) If the RAID crashed somehow via the software, would the data still be recoverable? I have a MP and will be putting them in Bays 3 & 4. Also, is there any benefit to the different block sizes? Since my files will all be at least 7MB would the biggest block size speed it up?