After building a new computer last semester, I've filled up one of my 500gb drives, and need to go about buying some more hdd's. I also just got a dslr, and want to make sure that my pics and documents are backed up. So here's the question: do I go with RAID, or should I just get a couple external hdd's and back up that way. If raid is the better choice, should I do it on my main computer, or build a cheap computer just for that? I know my Asus P5Q Pro can supposedly do raid, but my sata ports are almost all filled, I think there's only room for 2 more things to plug in. So what do you guys suggest.