Instructions
Turn on your Xbox 360 and a controller and open "System Settings" from the "My Xbox" menu.
Click on "Memory," and then choose your hard drive from the list of storage devices.
Select "Game saves" as the type of item, and then choose the specific game save you wish to move to your memory unit.
Select "Copy" or "Move," and then select your memory unit as the destination. Your Xbox game save will now be moved.