My iMac's GPU is failing. I'm booking it into a an Apple retail store soon for repair and I need to back everything up; by backup I mean that, once repaired, I want to restore it exactly as it was (more or less!) I have a 500gb external HD and I've never used Time Machine before but will it do what I need? Can I use Time Machine to copy my ill Mac so that I can restore it back to just how it was once I get it back? Will it work with my Boot Camp partition also or do I need to use a separate option (in Windows...eugh!) or will Time Machine help me with this? Any advice will be superb fellow Mac users!