Things You'll Need
Instructions
Insert the USB storage device into an empty USB slot on the front of the Xbox 360.
Highlight "System Settings" in the "My Xbox" menu, and then press controller button "A."
Scroll down to "Memory," and then press "A."
Press "A" again after highlighting "All Devices."
Scroll down to "Gamer Profiles," then press "A."
Select "Move," and then choose "USB Storage Device" as the destination drive. Your Gamertag will backup onto the USB storage device.
Insert the USB storage device into the USB slot on another Xbox 360 to use your Gamertag on that system.