If you want to update the software on your mobile phone, it's recommended you back up the phone memory.
Connect mobile phone and computer
Back up phone memory
Connect the data cable to the phone socket and to the computer's USB port.
Start a file manager on your computer and find your mobile phone in your computer's file system.
Go to the required folder in your mobile phone's file system.
Highlight the required file and move or copy it to your computer.
*Please refer to the HTC website for more information or further support.*