If there is a thread on this please direct me there. I'm still running 10.7 but I'm assuming I'll need to upgrade to 10.8 before I can get 10.9. Either way how would I go about doing a clean install of ML? I have my entire HDD backed up as a clone on an external HDD using CCC. Once I erase my internal HDD can I download ML from App Store through the external drive and install it on the internal drive then migrate my contents over?