It allows local hosting; however, thumbnails are sent through an unprotected, cloud based server where they were also cached. It was easily hacked a while ago, when someone figured out the file names, and their patch was to make the file names more obscure so they cannot be guessed.
I bought them a couple of years before the hack, and shit hit the fan. All my cams are external, so the privacy aspect isn’t as high as those with them inside a child’s room or elsewhere inside.