Plug the iPhone into your iMac using a USB cable. If iTunes doesn't launch automatically you will have to launch it manually. The iPhone should appear in the left hand column under the heading of "Devices". Select the iPhone and in the right column information about the iPhone should appear. At the bottom of the "General" page you will see a button labeled "Synch". Click that button and the first if five synch steps is to back the iPhone contents up to the iMac. The data is stored in the iTunes library.
If we knew what it was we were doing, it wouldn't be called research, would it?
— Albert Einstein
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