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Before updating your device's software, it's recommended that you back up the device memory to ensure that no data is lost. It can also be useful to back up the device memory regularly to ensure that no data is lost in case of defects and crashes. Follow these instructions to back up the device memory.
Before you can back up the device memory, you need to install the program iTunes on your computer.
Connect device and computer
Back up device memory
Right-click your device on the list of connected devices.