Hello, i just bought a new hard drive for my MacBook Unibody 2.4 GHZ. i use time machine on it, but with the new hard drive, i do not want to do a complete restore of my system, i want to just chose what to put on it. would it be possible to switch hard drives, do a clean install of Mac OSX, and then use my old time machine back up, with my new hard drive, to get back the files i need? or will i have to back up all of those on my external before hand?