Great, lost my whole 5 hour game file and the old files are no longer backed up on the cloud.

I lost my save, was at act 3 :/

We're very sorry that some save files were lost during the period with the cloud save issues. We're going to be vigilant about it in the future.

I started the game on Steam Deck. My savegame has been deleted when I started the game on my Linux Mint PC. It was impossible to recover savegame.

Maybe you should implement some historic of saves because in a so long game like this it's a very annoying error.