I have Syncthing installed via pacman (since flatpaks cannot keep a daemon running). For every game that I care about, I find its save file, move it to a sync dir, and symlink it back to where it is expected. My savegame sync folder has folders for the many varied places that games like to hide their saves - “gamedir”, local, locallow, “my documents”, dot_config, etc. The most fun part is finding out where the appropriate proton prefix is.
If I was starting over again, there’s a decky loader plugin that looks promising.
Also using Syncthing. It was pretty simple to setup. I’ve been using it for syncing emulator saves mostly but also started using it for steam games that don’t have cloud support.
I’ve had zero issues and the syncing can be set to a low amount of seconds so it’s basically in real time. No need for the app to close and then sync. If I save while playing TOTK, I can see it on PC immediately.
Same here, except I didn’t even need pacman; you can download a standalone executable of syncthing and run it as a user service.
