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Before updating your phone's software, it's recommended that you back up the phone memory to ensure that no data is lost. It can also be useful to back up the phone memory regularly to ensure that no data is lost in case of defects and crashes. Follow these instructions to back up the phone memory.
Before you can back up the phone memory, you need to install the program Zune on your computer.
Connect phone and computer
Back up phone memory
The backup starts automatically.
Follow the instructions on the screen to select the required settings.