I bought a MBP a few months ago and used CCC to clone the "factory" HDD onto a 32GB thumb-drive with no issues. Ironically, my new MBP has sat untouched in a case since then. Now I have all of my software installed, and accounts set up, and so on, and I want to use CCC to make a separate clone - this time with a fully-functional set-up. So... Dumb question... But how big of a USB Drive will I need now?? For some reason, it seems like just checking how much of my HDD is being used isn't enough information. Is there a more scientific way to make sure that my Thumbdrive is big enough to successfully clone my MBP (with apps)? Or am I over-thinking things again?! Hope that makes sense?! Thanks, Debbie P.S. There is no Personal Data on my MBP.