NewsRob stores article assets (images, html etc.) to the SD card.
When everything works fine NewsRob deletes those assets when the article itself gets deleted by NewsRob.
But in some cases this automatic cleanup is not possible, e.g. NewsRob is uninstalled and then later on installed again. The old directories and files of the pre-existing articles will still be on the SD card.
So in the future NewsRob should regularly remove all directories/files for which no article is existing in NewsRob's database anymore.