I used the Firefox extension Scrapbook, until the change to WebExtensions killed it.

I feel changes like this are incrementally making the Web "theirs" and not "ours".

Separately, someone replied on here to me, a few months ago, that archive.org's policy for respecting -- or not -- robots.txt was in the process of changing.

I don't think that putting up a robots.txt policy should be able to retroactively remove from archive what was previously public. All the more so when the domain in question has changed hands.

But I expect this nonsense to continue. So, I only trust local copies.

Unfortunately, for me, killing the Scrapbook extension made them less convenient to collect.