Do you really want auto-updates for your games, or actually just want updates-on-demand? Or just a notification with a button to update the game?
Personally I dislike Steams auto updates, because I want decide when a game should be updated. I might have mods installed, only mobile internet or a myriad other reasons not to be forced to download and apply an update right at that moment and instead just play the old version.
For saves, I normally just use syncthing. I have regularly issues with GOG and Steam cloud saves, and syncthing works well enough,