I need some guidance from you seasoned vets. I just got a MBP and want to purchase an external HD to back up EVERYTHING. How do I do this? Yeah, I know it's a broad question, but some things I need advice on are: - what size of external should i get and what brand? (MBP is 250GB) - what program should i install on the MBP to do the back-up? - to do back-ups...do i just connect the external to the MBP and click "back-up"? Thanks for helping a noob....and any other info you want to offer up to assist is GREEEEEAAAATLY apprecaited! Merry Xmas!