I have the image: DM52xHD : OpenPLi 7.2Star 20200327 GSt 1.17.0.1 (Original). I am very happy that there is a PLi image for my original DM520 but because I am happy I want make a backup so I can always go back to this image with all his settings.
In the mage there is backupsuite installed already so that should be easy. I get everytime this error, see last message in the picture off the screen of my tv.