Steam Cloud doesn't seem to be backing up my save when I play on Steam Deck.
Properties -> General -> Steam Cloud, I'm seeing: "0 bytes stored / 9.77KB available".

I started the game on Deck. I went to boot it up on my PC to continue since the game uses Steam Cloud Saves. I have cloud enabled on both machines. I've even successfully gone back & forth with cloud saves for Dread Collection 1. I know the game technically says it's not even supported on Deck, but other than this, the game seems to run completely perfectly on Deck.

Not a huge deal! I'm happy the game works at all on Deck considering it says it's not supported. Just figured I'd mention this in case the devs wanted to look into it or someone else ran into the issue.