first off, thank you in advance for taking time to answer. I run a music studio on an iMac 2010 i7 27". This machine is running Snow Leopard still. I usually don't upgrade ofter since some plugins for music softwares and such don't get an upgrade soon so I avoid crashes and all. But now I'm two versions back and I'm starting to need the new features in the newer systems. I have iPhoto 11 that I use all the time as well as iMovie 11, as well as out of date Pages and such. My question is: How can I upgrade the system (Mac OS) as smoothly as possible without loosing my data. I want to move my iphoto and itunes libraries to an external drive to free space and avoid loosing my data is something crashes. This leads to a second question: How can I upgrade iLife without things getting messed up?? Should I just go to the app store and purchase the upgrades and it'll be smooth sailing afterwards? What should I watch out for? THANK YOU.