Re: Are these the only 3 known updated Usenet archives left?

I'm curious whether the HTTP source mentioned supports range-requests,
and whether HEAD for those resources results also the size, with
regards to making a HEAD request to get the size then making a plan
to download these files which would be expected to be constant now
in batches of range-requests and so on.
 
It would be very much and greatly appreciated if these are indeed
archives of pretty much all text usenet since the land before time.
 
About how to search these is you break them out into whatever then
makes for a summary of these files, like a pyramidal sort of
organization, then as with regards generating summary which these
days seems the "inverse-document-frequency" pattern as much as
otherwise summary and links to document IDs, to, search or query
for documents of a kind and result message-ID's their relevant
documents, or "hits".
 
If these are really the thing for something like "Archive Any and
All Text Usenet" it would be pretty great with regards to these,
and some of the other Internet Archive and other archives mentioned
over the past few months as after Google quit Usenet (one imagines
it was a bit too interesting to its latest/greatest knowledge gobble).
 
Well then warm regards and I shall so hope that such a resource,
as this portends to be, finds a good and fair usage. If so, good show.

Unfortunately I don't understand a word you said but I will assume others
who are Usenet aficionados understood.

This is my assessment of the 4 known web-based no-login Usenet archive
search and retrieval mechanisms which require no special Usenet skills.

1. Nova (works the best for new messages posted after 22Feb24)
   <https://www.novabbs.com/computers/search.php?group=name.of.newsgroup>

2. Google Groups (works the best for old messages prior to 22Feb24)
   <https://groups.google.com/g/name.of.newsgroup>

3. CMacLeod (too many button clicks to be useful)
   <https://cmacleod.me.uk/ng/name.of.newsgroup>

4. Narkive (nice site by a nice guy but fails too often to be useful)
   <https://name.of.newsgroup.narkive.com/>