In Pictures: How to Clean and Retouch Old Photos w...
2. Save the image before working on it. You may want to create a duplicate using File-Save Copy As. You can also create a new raster layer to further protect your picture against any unwanted editing and saving mishaps. Choose Layers-Raster Layer, and then click OK to accept the default settings.
In Pictures: How to Clean and Retouch Old Photos with Paint Shop Pro