One thing that is worth saving is the PDF manuals for physical products that you own.
These sometimes disappear from the Web. Or disappear except for some third-party site that modifies and/or paywalls them.
Also, save the occasional important support info Web pages for those products. You'll know it when you see it. And if you don't save it now, it might be gone when you need it.
You don't need a fancy system for this. I just made a directory `~/doc/`, and started dropping files into it. Someday, I'll take the time to merge this with `~/wiki/`, but for now, I'm capturing the information with low friction, which is most important.
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