Google Search
Probably because you have an image in some page and Google is linking that image.
The images are located in bl-content/uploads/pages/<image-name>.jpg
The images are located in bl-content/uploads/pages/<image-name>.jpg
Nothing to worry about that links, all the content on bl-content/uploads is public.
The private data is located in bl-content/databases/ and bl-content/workspaces/
The private data is located in bl-content/databases/ and bl-content/workspaces/