Hello there! I bought my MPB 13 last year and it shipped with Lion but the guy at the Apple Store download Mountain Lion for me and guided me through the installation. Now I want to upgrade to Mavericks but Im not certain of how to do a clean install and yet be able to restore all my files and applications so Im coming here to you to see if you guys could help me understand the process. I already downloaded the OS X 10.9 installer and had already prepared the USB installer with it. I have a full backup of my Mac with TimeMachine. Now, once I had done the clean install, will I be able to import everything (files, folders, apps, etc.) using that TimeMachine backup? Would I need to re-download and re-install every single application? I had both Mac App Store bought and internet bough applications. Thanks!