Every electronic device is prone to occasional malfunctions and your iPhone is no exception. When a hardware or software glitch occurs causing the iPhone to freeze, drop calls or otherwise function erratically, restoring the phone to its factory settings may resolve the problem. Before you restore the phone, however, you should create a backup of your contacts and other personal data on the device. The iTunes application on your computer will do this for you whenever you synchronize the iPhone to your computer. If you want to ensure that a backup is created, you can sync the devices manually.
Connect the iPhone to your computer using the USB docking cable.
Open iTunes if it doesn't launch automatically.
Right-click on the name of your iPhone in the left pane of the iTunes window under "Devices." On a Mac, rather than right-clicking, you use "Control"-click.
Select "Back Up." Itunes will commence the task. A full backup may take several minutes. Do not disconnect the phone from the computer while the backup is being processed.
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