Ok so i upgraded my 27" iMac to lion a few weeks ago thru the app store. I am looking to do a clean instal ( wipe the machine, start for fresh ) but i do not want to lose all my music, photos and movies. I do have a time machine backup. How do i do a clean instal of lion? I dont have the downladed file nor do i have the USB drive, i just downloaded it from app store last week. Once i do the clean instal, do i just drag and drop the videos, music and pics from my time machine from a previous date? to get them back on my imac? I am a bit new, so any help would be great, thanks!