Select your save file, choose , and select your USB Storage Device .

Plug your USB into the Xbox 360, go to Storage, and save your current Forza Horizon 2 game onto it.

When booting Forza Horizon 2, select as your primary storage device. Transferring Saves to Another Xbox 360

Xbox 360 saves are locked to a specific Profile ID . To use someone else's save, you must "resign" it to your profile: How to Transfer & Resign Xbox 360 Game Saves