Photoshop - Rescue your original even after you save over it in Photoshop (7/CS/CS2)

Tip: Rescue your original even after you save over it in Photoshop
(7/CS/CS2)
Have you ever made changes to an original image and then accidentally saved over it without making a backup copy? Well, if this sounds vaguely familiar, then we have some good news for future accidents. To recover your original image, go to the History palette, and click on the opening snapshot to make it active. Next, click the Create New Document From Current State button at the bottom of the palette. Upon doing so, your original image displays in a new document. Choose File > Save. Now, go back to the History palette and click on the last History State listed in the History palette. At this point, it's a good idea to save your file with a different name to ensure the safety of the original file.