Instructions
Select a storage device when prompted after starting "Ghostbusters: The Videogame."
Progress through the single-player campaign until the autosave feature saves your game progress. The autosave icon, which is a red bordered circle, will display on the right-hand side of the screen.
Press the "Start" button on the game controller, then chose "Quit Game" from the main menu when you are finished playing. If you escape from the game without first doing this, the autosave files will be wiped from your system.