It's easier to add "No Save" to everything, and then remove it from the things you want to be saved. From the manual:
"It is a good idea to add the No Save behavior to objects which don't need to be saved, like scenery and background objects. It can also be used on automatically updated objects, like interface elements and text objects which update their text every tick. This will help make the saves smaller in size, and also complete saving and loading quicker."
For example, if you have savepoints in your game (save statues, whatever they're called at this point). Then you most likely would like for the player's position to be saved as to not be different when the game loads again. Sometimes you might want an enemies position be saved as well so that you can't save, go to menu, reload save and the enemy is gone. But generally, most things don't need to be saved.