If you want, before a really critical turn, (like pretender doing death match maybe ?), "save and quit". Then go into your Dominions 2 folder and Copy then Paste the game folder(the one you named your new game, not Dom2,
, to your desktop. Restart, play the turn, if result sucked for you, "Quit, Delete game folder in dom2, copy in the one you pasted to desktop, restart, replay, etc." Good luck.