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CUPS mirror image printer setup
(lemmy.ca)
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It is certainly useful for some use cases such as network print servers (I have a dedicated lxc container on the network to do this) and custom conversions of pages (during my digging, I learned about companies using a CUPS network printer to watermark every document being printed).
I'm not an expert by any means: it is definitely a useful tool in certain cases, but oh man.. the documentation was a bit hard to figure out for me!