How do I delete saves I don’t want?
You can manage your data for individual games through My games & apps on your Home screen. Here's how:
On Home, select My games and apps.
Highlight the game, press the Menu button on your controller, and then select Manage game.
In the menu on the left of the screen, scroll down to Saved Data, then highlight the saved data for your gamertag on the right and press the A button on your controller.
You'll be prompted to confirm deletion of this game save data:
Delete everywhere removes your saved data from this console, the cloud, and all other consoles you play on.