Agree they will at some point nuke that subreddit.
Pretty much everything has been archived that could have been, since the API goes dark in ~2 days.
There's details of what apps were used, where to download the archives directly, links to torrents and such on a post from /r/DataHoarder which I'm collecting links/text/guides from over in our Gitea instance as well as importing projects used for this effort.
So far, there's like ~5-6TB of archives I've downloaded through the links in that post, others on /r/DataHoarder, the-eye.eu, etc.
They go back allll the way to 2005.... It's just text though, no media. Unless the media was a link to Imgur or YouTube or something, then the links are in the posts.
There's a couple bots/scripts that will repost new stuff moving forward from RSS feeds.
To inject directly from those backups into a Lemmy PostgreSQL database, I was using this tool, RedditLemmyImporter. Which, actually looks like it was made by the lemmy developer dessalines moving the r/GenZhou subreddit into lemmy.ml/lemmygrad.ml originally but forked very early to try to obscure that..... so I do feel a bit dirty about that, and more so about Lemmy in general from some of the things I've seen from dessalines themselves.
TBH..... I think it's important to make a Fork of Lemmy itself, and to really really comb through this code base. Not sure if this is a long term solution if dessalines is still the head dev, one of the reasons I'm setting up other forums on this server as well. Lemmy and non-corp/federated social media is good, but I'm not liking the stewards of the lemmy code base the more I read their direct words/actions/history/and code like this importer.