So the image file you have created contains some data files (pictures, documents, mp3s etc.). You have also copied and pasted these files to the external hard drive. Not a problem, but in my experience with Acronis, not only can you restore the entire image in the event your original drive fails, but you can restore individual data files (or a bunch of them), in the event you mistakenly delete a file, it gets corrupted, or you otherwise mess it up (like editing a photo, and then realize you screwed it up and want to go back to the original).