Saving a backup copy in Photoshop

You usually want to have a backup copy of an image safe on your hard drive any time you make changes to a file and, often, periodically throughout a work session. If you change your mind about the modifications you’ve made to an image, you can always return to the backup copy. Photoshop offers several ways to create such copies:
-->Choose File➪Save As and enter a new name to the file. It’s also a good idea to specify a new location, such as another hard drive or perhaps a removable storage destination, such as a Zip disk or a CD-R/RW disc.
-->Choose File➪Save As and select the As a Copy check box. Photoshop simply adds “copy” to the current filename (for example, myfile.psd becomes myfile copy.psd) and saves the file under that new name.

Photoshop also enables you to create backup snapshots of your images at any time (or even a snapshot of an earlier version of the image by using the History palette). However, because Photoshop does not save these snapshots when you close an image, you should use them just as backups during a particular working session. In addition, Photoshop now offers a Layer Comps palette, which enables you to save different configurations of your document by recording the appearance of your layers.