Yeah, Usenet servers all have a maximum retention time, usually around 3000 days or something like that. Any articles older than the retention time of your server won’t exist for you to grab, but stuff is usually reuploaded frequently. With torrents a super niche thing requires someone seeding the content all the time for it to be consistently accessible, while Usenet requires someone to reupload it once every 5-10 years (barring takedowns) which imo is more consistently stable, but as the other poster said having both ensures your bases are covered. I personally don’t really torrent anything beyond oddball bbc2+ documentaries at this point though.