Autosave works after the game is unpaused
I don't know how it actually works. Whether if the game makes saves while being paused or just countdown continues. I don't think the first one is the case. It seems like backup saves are not being affected.
I always see the autosave notification after unpausing. This suggests that autosave works when the game is paused for a while and then unpaused.
PS: Sorry, I accidentally submitted in ideas topic.