Alright, here's my scenario. I have a new Macbook which has 120 gb hard drive space. I want to backup my entire system using SuperDuper every week or so to avoid losing my data in case something went wrong. I'll probably create a bootable backup but either way i just want everything i have to be safe. So, which route should i take in terms of USB or firewire? What size would be good for my situation? Any brand hard drive that i should look at and/or stay away from?