I have recently bought a 24" iMac and am going to be opening it at christmas. I am looking into time machine. My questions with time machine are as follows: 1. What can I bck up to, I have thought of a External Hard Drive and also a Hard Drive enclsure with a hard drive in it. 2. Is it possible to back up to a hard drive on a different comuter (WINDOWS computer) 3. On Apples Time Machine it says any HFS+ formated hard drive. What is HFS+ formated and how do i tell if a hard drive is HFS+ formated.? 4. What would be an ideal hrd drive for me? My new mac (first mac) has a 500GB hard drive in it. Thanks and Best Regards Rocks!!!