[2022] save deleted

Neither the game nor Steam deliberately delete save files.

Are you 100% sure it was a cloud save not local?

If you tick the "View Invalid Saves" button in the Load menu, does it show there?  

If you haven't started any new campaign since, you can get the file Documents/Paradox Interactive/CK3/last_save.ck3 and move it to the /Save Games/ folder there.

Does that help?  

No, I don't - it's not a known issue with the game in general.

If you now start a new test campaign does it save okay, whether local or cloud?  

So there is something about that particular save game file that prevents the game from saving it, would you say? Very weird, if so.

What happens when you do a manual save - any error?  

Ah, I see. Do you even see the "saving game" display then?  

Might be one for the Bug Reports forum then!