Hey, so lately my mac has been slowing down a bit. My HD is almost full and I have a ton of crap on here I don't need. I was wondering if it was at all possible to install mountain lion when it comes out on a partition as a fresh install, then move the stuff from the lion OS that I want to keep. (It will act as my backup) then later remove the lion OS and give mountain lion my full hard drive? Basically my issue here is that I want to do a clean install of mountain lion, but I have no external harddrive or anything like that to back up my stuff. Any ideas? Thanks for the help.