Because the game saves constantly, manually backing up is the only way to “reload” an old state.
Mat Dickie updates the game frequently. Ensure your game version matches the version the save file was created on, as version mismatches can sometimes cause errors. The Power of the "Editor" wrestling empire save data
If on PC, Steam might try to sync an older version. Ensure your local file is the one you want. Because the game saves constantly, manually backing up