I only have about 249gb of space hard drive available I'm only wanted to do a one Time Machine backup so I can completely clean install my MBP and start with a fresh machine. I don't mind really setting up my computer system preferences and what not. But I want to make sure I get a back up of all of my files, photos, etc. I sync with MobileMe so my contacts, bookmarks, notes, and calendar is OK without backing it up. Since I'm new to Time Machine, can someone recommend a few things to exclude for my back up to so that I can get a complete back up since I don't mind the actual setting up of the email, system preferences, etc.