The backbuffer DOES have alpha in a 32-bit screen and if asked for, but it's a matter of whether anything you draw puts anything into the screen's alpha channel and how useful that is to you and whether you want to make use of it when you download it to a pixmap. DrawImage doesn't draw to the destination alpha channel, for example, so you can't draw something with it and then expect to grab alpha values from the screen.
grabpixmap and save with alpha
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