[Legion]

Dolphin's Twitter account stated that cloud saves was part of the Steam release.

It really is one of the main reasons to do a Steam release. Seamlessly playing your savegames and save states on desktop PC over to Steam Deck and back again made RetroArch one of the killer Deck apps IMO.

[chungy]

Even without Steam, you could use Syncthing for your Dolphin-emu data.

[MikusR]

Or even an ftp server and rsync.