I have an ibook with a 55 gb hd in it and I'm looking to buy external hard drives. What I don't know is how I should manage it. What would be better, to buy an external one the same size as my internal for backup, and a second one for archiving purposes? But then I would need to back that up too. Would It be a good idea to get two larger hard drives, and have a partition of one of them for backup? What do you use for your hard drive setup? How does it fit into your photo workflow?