Each time your sync your iPhone, the data, settings, and other information on the phone are automatically backed up on your computer. If you encounter a situation in which you need to restore, though, all you need to do is download this back up to your phone and you’ll be off and running again.
To begin to restore your iPhone data from the backup, connect your iPhone to the computer that you normally sync it to that contains the backup file (in most cases, this will be your normal computer. If you’re syncing to more than one machine, you should have backups on both computers. Just choose the computer with the backup you prefer).
More Reviews: http://www.iphone-mac.com/how-to-iphone.html
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