It is already keeping track of all this data at all times. How would the game be able to function if it wasn’t?
Some data is removed as you play. Ever wonder why the bodies of dead enemies often disappear after a while?
Saving a game, as others have said, is simply recording the information you already have in a nice format. Sometimes removing information that is not essential to keep between saving/loading.
Also, as others have said, for the most part this is not all that much information. It’s mostly just a bunch of numbers and true/false values, which are stored very efficiently. It takes up just about no space compared to for example video.
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