[NTG-context] Example ConTeXt document: PS output

I've just installed ConTeXt "minimal" and had a look at "ConTeXt, The Manual". I typed in the example document that starts at the bottom of page 13 (called it eg.tex) and ran context. It produced the file eg.pdf and I notice that it ran luatex with the option "--backend=pdf". Thanks, those who have done massive amounts of advanced work on ConTeXt and luatex, huge projects which are costing me nothing. But, I have a problem. I have a PostScript printer. I'd prefer not to have to run pdf2ps. How can ps output be produced directly? "context --backend=ps eg" doesn't do it and there is nothing about --backend or other options in the index, of "ConTeXt, The Manual", as far as I can see. There's no Reference/en/backend on the wiki.