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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.
Find the download section on the web page to download Zune.
Download and install Zune on your computer.
Connect phone and computer
Select backup settings
Back up phone memory
If required, press START SYNC to back up the phone memory manually.
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