What exact does Save Game State ACTUALLY save ?

Is it REALLY a one to one snapshot ? Almost like a "System Image" of the game, that when recalled, brings back all internal variable values ?

What does it NOT save that users should be aware of ?

It should be everything, at least for the system and official plugins. If anything doesn't then that would be a good reason for a bug report.

For third party plugins it depends if the author implemented that part or not. I know for example most of my plugins don't impliment saving and loading, but I guess that's on me.

Thank you, it is really quite amazing that a single function can do this when one really thinks about it.