Unlike many other titles, Gran Turismo 7 stores the vast majority of its progression—including your car collection, license progress, and credit balance—on the rather than purely on your local console storage.
: If you attempt to modify a local GT7 save file, the game will typically overwrite your local edits with the "official" data from the servers the next time you connect.
: Series creator Kaz Yamauchi stated that this online requirement was implemented specifically to prevent save data modification and cheating.