I bought a new MacBook Pro in late June and I'm planning to get Mountain Lion once I get my redemption code.. I'm a new mac user so I have some questions. First of all, should I do a clean install or just upgrade? What is the difference? And also, should I backup my stuff? If so, how do I do that? Do I need to buy something or get a blank CD or USB with enough gigs..? Also I read somewhere that sometimes there are errors when downloading ML.. is there a way for me to avoid that? I guess since I'm new to this I'm afraid I'll do it wrong and I want to avoid that. Sorry for sounding like a n00b :/ Thanks in advance!