Described herein are processes and devices that utilize non-volatile memory on a wagering game machine. One of the devices described is a wagering game system. The wagering game system can receive a request to activate a first wagering game on a wagering game machine, receive critical data for the first wagering game and store the critical data to a fixed-size block within a non-volatile memory store so that the non-volatile memory store includes critical data for only that wagering game. The wagering game system can then copy the critical data for the wagering game to a backing store, verify that the copied critical data on the backing store matches the critical data in the non-volatile memory, activate the first wagering game, present results for the wagering game, and update the backing store with changes made to the critical data on the non-volatile memory store during a game session.