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Copy the Background layer to create a Background copy layer.
There are several ways to do so.
Click, hold, and drag the Background layer onto the Create a new layer icon.
The icon looks is a white square with one corner being folded over (dog eared).
In 6.0 and 7.0, the Create a blank layer icon is located at the top of the Layers palette.
In 8.0, the Create a blank layer icon is located at the bottom of the Layers panel.
Right click on the Background layer, and select Duplicate Layer.
You can also go to the Layer menu at the top of your screen.
Go to Layer > Duplicate.
Press Ctrl + j.