03 Oct 23: One server was relocated, the server currently doesn't have a public IP address since in the meantime it is running on starlink. I wrote some additional tunnel code running separately to handle this. When the server is engaged the connection is 5600+ days uniform (since around 24 July 2008). In the unlikely case I disengaged the server because of some problem the retention is 1200-3800 days depending on newsgroup. If you experience any issue please let me know.
29 Nov 23: Because of encrypted and obfuscated posts flood mass posted by a few nzb indexing websites using usenet servers as private storage for their members to download the posts - the situation with the content is pretty chaotic since their purpose is to post in such a way, so users must use their website exclusively, when the website disappears - the encrypted posts just eat usenet providers' hard disk space uselessly. If you can't find something specific please let me know at alexbirj at gmail dot com what exactly you can't find for me to check how it is possible to retain the posts. Non-obfuscated posts shouldn't be affected at all, let me know if you notice anything missing.
29 Nov 23: The search protocol had to be upgraded to extend 3 byte (16M+) limit on the server side for number of sets per instance, so at least the version 5.8.3 is needed to access it, otherwise should be no any difference.
i've added it (headers are already there), initially it will be at 117 day retention then growing (it is about 2% of files, the rest is at 150 days), since it is the current max newsservers header feed retention Ngroups/UNS, I see the newsgroup is about 2.7M headers.
later i'll try to write something to find differences between newsgroup lists of news and indexing servers.
i've synchronized the current newsgroup list for non-picture groups no "pict" in the name, it is now in the process of downloading headers.
with picture groups i'll do it a bit later, i have an idea how to draw picture groups from the backup server as it is done now already, but in the same time to optimize its usage so we won't sacrifice retention and update the whole newsgroup list on the backup server as well, maybe i'll do it later today or tomorrow, most likely to do it we need a small server code change, i haven't checked it exactly yet.