All of this is cover in my first LP video, but I’ll summarize it for you.
1. 1850, 1900, & 1950 are the only starting years at the time of this post and must be unlocked by reaching them ingame (unsure if they’ll change it or not).
2. Unlimited, or untill you run out of hard drive space. (Note the average savefile & autosave is ~250 for the largest map each and auto sves DONT overwrite themselves by default)
3. The developers said theyre more conserned about fixing/adding new content to the game for testing than trying to make pervious saves compatible with newer versions of the beta so most of the time a new save is required.