So my MBP has some funky display issues so I'm going to bring it to the Apple Store this weekend. Before I go I want to make sure everything is backed up on time machine incase they need to replace the whole unit or keep it for a few days to repair it. If they lost my data or had to give me a replacement one would I just be able to hook up my USB HDD and let Time Machine bring the new MBP back to it's old condition? Would all of my program and settings be just as I left them? Bookmarks in Chrome? Would all my iTunes purchases still exist as they do now? Would I need to authorize iTunes again (using up another one of the five allowed?) Should I wipe my HDD before I drop it off or should I trust that they would do that for me if replacement was needed?