I’ve had to fuck around with my Windows saves (backed to the cloud) when installing the Linux version of Wasteland 2 and the two Pillars of Eternity games and I eventually just gave up and installed them with Proton so it would download the saves to the right place for them to work.

If you play Deadfire on multiple Linux devices you need to install with Proton compatibility otherwise cloud saves don’t work at all because Steam doesn’t back up the right folder (it uses the Windows folder name which has a lower case o in the word Of), that means that if you wipe your hard drive and rely on cloud saves then you’re fucked because Steam will have created an empty folder to backup.