I usually manually backup my save to my sd card on my steam deck. Now my left touch pad broke, i have to manually copy and paste, gets tedious. My idea you select backup option to a back up drive like a sd card or usb. While saving, under save and continue there will be save and back up. Makes a new back up save every (save and back up) in that drive.
Edit: how i broke my left touch pad. I sat on it by accident. Smashed in.