I have been using my first ever Mac for a few months now and I love it! The thing is, it's still running OS X 10.6.3 and I haven't updated the OS before. I thought it was about time I updated, particularly with the Mac App Store, but I have a few questions. Firstly, how long will the process take? I know the length of time the download will take depends on my internet connection, but how long does it take to install once the update has downloaded? Also, is there any danger of something going wrong? Should I back up everything before I try updating and, if so, what would be the best way to do that? Finally, I still have some old versions of various applications that I haven't felt the need to update, such as still using iTunes 9 as I don't feel I need any of the new features in iTunes 10. Will this matter or should I update those to the newest versions first? Sorry for being such a noob! Hope you can give me some advice!