History can make a snapshot automatically every time you save your file, enabling you to return to any previous state. Turn on this option in the history flyout menu under options.
You can also pick any point along the history timeline and use the flyout menu to choose 'new document'. A copy of your image with only the changes made up to the point you selected will appear.
You can also pick any point along the history timeline and use the flyout menu to choose 'new document'. A copy of your image with only the changes made up to the point you selected will appear.
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