How to make sure images stay in content folder?

I needed an easy way to control size of images, so I’ve been using following workflow:

  1. Drag image to the editor
  2. Get the URL of the resulting image
  3. Insert HTML snippet which adds image with width attribute.

However, now I have two images on the page. Can I delete the original image or hide it somehow? My concern was that if I delete the original image, Ghost has no way of knowing I’m still using it, so it could automatically delete it.

Example image URL obtained this way:

Image files are never deleted because as you say Ghost can’t know if an image is being used elsewhere.