I just bought and set-up a new iMac. When you first power on, it will ask if you have a prior Mac and if you want to transfer files, programs and settings from the old Mac to the new one. You will have a choice of using Firewire, ethernet, or wifi. I chose to transfer all files data using ethernet. This took about 2.5 hours and essentially created an exact clone of my old computer on the new Mac, without changing anything on the old Mac.