I'm going to get a new external HD for my iMac (2.8 extreme / 4GB of ram). I'm looking at the WD mybook (which I have one now) and the Seagate FreeAgent. They both look good. My question is if I get a USB or Firewire external drive is it a good idea or safe to use that as a raid 1 setup. The one thing I miss about my G5 is the internal HD. I'd really like a raid 1 for a constant clone/backup. I've just never thought about using an external HD to do such a thing. Also I'm guessing it really won't matter if I go USB or FireWire. From what I've seen the speeds are nearly the same (correct me if I am wrong). I was just curious if it was alright to do. Not sure if it would slow things down since it was not internal, etc. Also am I safe in assuming that if I plug in a new drive and set it up as a mirror I will "not" lose my data on my main drive? Any help is greatly appreciated. Thanks.