Just a quick response: The "regular" / manual restore without the scrip has worked flawlessly for me. It's the most convenient way in order to get OMV up and running with the latest config changes. I do have clones of the sdcard though but as I am doing this procedure always on a different machine I would have to shutdown the NAS what I am trying to avoid. Really nice work.
Maybe I will also have a look into the script later on but for now it is as easy as it need to be for my needs