The default save system is like this : it saves everything except the nosave behavior objects. If you want to do another type of save, you have to do it manually. This means create a function that prepare your save and store it (in local storage). Then do another "load" function that loads the game from the local storage.
Local storage is a cache system letting you store datas through different sessions. It is a local system, meaning the same user going from a computer to another will lose its save. If you have a login system, you could also save it online.