The Save a Copy command does the same thing as the Save command, but with one important difference. It always asks for a file name and saves the image into the XCF file format, but it does not change the name of the active image or mark it as «clean». As a result, if you try to delete the image, or exit from GIMP, you are informed that the image is «dirty» and given an opportunity to save it.

Эта команда полезна в тех случаях, когда хочется сохранить изображение в его текущем состоянии и продолжать работать над ним.