ROCK running hot and music suddenly stopped after adding new albums

I went to take a backup of my Music folder today (aka InternalStorage on the ROCK NUC), and discovered that in the folders was another folder called InternalStorage, which contained an exact copy of all the folders contained in the top level InternalStorage. And within the copy was another folder called InternalStorage… and so on. It’s turtles all the way down.

The ROCK web page claims that I have still 41% free of the 924 GB storage on my 1TB internal HDD. Bizarrely, when I come to delete the second level Internal Storage folder, the deletion process finds at least 12TB of files to delete…

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I have a feeling that it may be best to invoke the nuclear option and reformat the drive, and restore the music files from an earlier backup; but before I do that, do you guys need any information from the setup?