Forgive me for what's probably a stupid question I have a late '09 MacBook that I'd like to update to Yosemite, but I think I could probably benefit from formatting the HDD and installing Yosemite fresh, not just an overlay or update. The only things I'd like to transition to the fresh install are my iTunes library, docs, and photos. (I've been using Time Machine to back up my laptop every so often.) The few apps like Chrome and Skype can be reinstalled, but it's the personal files I'm most concerned with. What's the easiest way to accomplish this? I assume once Yosemite is installed I can plug in the TM drive and drag/drop the files (music/photos/docs) to the file system. Thanks!