Lemmynsfw admin here, partially my fault but mostly not.

The other admin owned the server and the domain, suddenly he stopped responding, I started getting concerned and shit you not before all this happened I was planning on making a backup the weekend AFTER the site went down. But of course that never happened. That's the part that's my fault, I should have been backing things up ages ago.

The server is down, and I had access to the server, but not the platform it's hosted on. One day the server just... turned off. Other admin isn't responding and I have no way to get the data from the site.

I have access to, but don't own the domain. So the plan now is to look into other hosting options, like the fedihost beta program, and spin up a Lemmy and/or piefed instance and redirect from the old domain to a new one I own. But yeah unfortunately it looks like the site as it was is dead :(