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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, crashes etc. Follow these instructions to back up the phone memory.
Before you can back up the phone memory, you need to install the program HTC Sync on your computer.
Select setting for USB connection
Connect phone and computer
Back up phone memory
After a moment the program establishes a connection to the phone.