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You can back up the phone memory to your computer using iTunes to ensure that no data is lost when you update your phone's software or if you lose your phone.
1. 1. Connect phone and computer
Connect the data cable to the socket and to your computer's USB port.
Before you connect your phone and computer, you need to install iTunes on your computer.
2. 2. Back up phone memory
Click the iPhone icon.
Click Back Up Now and wait while the phone memory is backed up.