Saving Version Sets
Other options in the Save As dialog window include Save in Version Set with Original and Save as a Copy. What the first feature does is save the new version of your (cherry blossom) shot with the original file for safe-keeping. In Organizer, you only see the original image, but if you right-click it, you can choose to see all the different versions you might have made from the original.
This is called a Version Set—single photos stacked into one file like a deck of cards. You can add more or delete existing versions as you need. Everything is kept in the one file, saving screen space.