This UsenetServer discount link gives you 1 trial month for $1, then $50/year after that, and includes a 1TB TweakNews block and a paid PrivadoVPN account.

Afaik most usenet providers have a retention period of 3000+ days (some even reaching 4000+). I've downloaded multiple things from the 90s without any problems. The oldest media in my collection is from 1957, so retention really isn't a problem I would say.

LOTR = anything from 4K HDR 7.1 Atmos, down to DVD is available (theoretically, as you can have items that exists, but can’t be fully downloaded so don’t work, because of DMCA and other things). The oldest release I see is 5800 days old and the newest is 4 days old. So people keep reuploading stuff if it’s popular enough. (I still can’t find some episodes of Ben 10 tv show lol)