I needed this too. Thanks.
Note that, in order to get your Switch games onto your PC / Mac, you have to have a DOS2 profile on Steam. To do this:
- Launch the game on the PC / Mac.
- Create a profile, create a character, and start a game.
- Save your game.
- Quit the game
Your profile should now upload to Steam. To confirm this, check:
http://store.steampowered.com/account/remotestorageNow you can enable Steam saves on your Switch. When it asks if you want to download saves, hit "B" for No. You may get the error "No compatible saves!" You can ignore it. Hit "B" again to exit. Your save should start uploading from your Switch to Steam.