Instructions
Insert a USB drive into a USB port on the console, and then power it on. Go over to System Settings on the My Xbox menu, and press ̶0;A.̶1;
Choose ̶0;Memory̶1; and press the ̶0;A̶1; button. This opens a Storage Devices screen. Highlight ̶0;All Devices̶1; and press ̶0;A.̶1; This opens the contents of your storage devices.
Select ̶0;Gamer Profiles̶1; and push your ̶0;A̶1; button. This exposes your profile. Highlight the profile, and select ̶0;Move.̶1; This takes you back to the Storage Devices list.
Highlight the ̶0;USB Storage Device̶1; option at the bottom, and press the ̶0;A̶1; button to transfer.
Remove the USB drive after the transfer completes.