When hosting this locally, I don’t see how 200 GB is much of an issue. Storage is so cheap these days, if you want to host it locally, just buy a 256 GB SSD just for that data for $20. Anyway, you were asking for a mirror, to which I replied with the information about the ZIM files. I don’t really understand the issue. Stackoverflow just isn’t that small, there is not much you can do about that.

I think it’d take a few hours to setup even a smaller copy of SO, which isn’t ideal for answering a quick question.

The download? Maybe, depends on your Internet connection’s speed. Actually serving it as a website certainly doesn’t take hours. It is rather a matter of seconds.

Of course they aren’t small, but they are probably as small as it gets, since they are pretty efficiently compressed. I am not sure what you mean by

it’s not a straightforward operation for even the average developer or systems engineer to restore these into a working format

since it is really trivial to use them. Just load them with Kiwix and serve them as a website. It doesn’t get much easier than that.

You can download pretty much all of stackoverflow as ZIM files for self-hosting.

Missed opportunity there, not being able to select all the other available USB-PD voltages. Not every circuit runs on 3.3 or 5 V.