I have a white MacBook, so it's not too hard to replace the hard drive. I want to know if i can back up my computer in its current state using time machine, replace the internal drive, reload the OS with the disc that came with my MacBook, and finally restore my computer to it's EXACT state using the time machine backup. I'm stressing exact because I've had bad luck in the past loosing little things... (iPhone restore) Also, if I do this will it void my warranty?