Did a quick search but couldn't find anything apart from a thread from ages ago suggesting this. I did a stupid overwrite of my save file (100+ hours IIRC) and rushed to check the autosaves to see that they were all overwritten as well while I was fooling around with creative mode.
I don't know how hard it would be to implement but is there any possibility of having map-specific autosaves like the way it works in games like Stellaris and other Paradox games, each save file you have is added to a folder for that game and each game has a unique ID to keep track of multiple save files. I've atttached some screenshots (ignore the empire names; my friends do too).
Main save folder - Ignore the names tyvm
The consciouscancer game saves
As you can see even if you save the game multiple times during a playthrough it gets added to the same folder, however it is possible to copy folders and change its name causing two different save trees to branch out without messing with each other. So in the end it's just tied with the folder the game was loaded from or last saved to, the folder names don't matter after the first save, (could just ask for "Game Name" at map creation).I understand this isn't a priority issue and is mostly just QoL, I only have myself to hate, it's just a frustrating experience as I can't do anything.