I think it's !shrooms@sh.itjust.works now
pornhubfan
As long as there's a subscriber to the community on another instance, it will automatically have a copy there, that's just how the federation works. It's not really a backup, and it only has posts since someone subscribed to the community from that instance.
But if you're worried about what will happen to old posts from lemmy.world communities: if you can read it now from your instance, it will still be there if lemmy.world disappears.
If you subscribe to a community in a different instance, it's automatically mirrored there. If lemmy.world disappeared tomorrow, I'd still be able to view all the communities from lemmy.world on sh.itjust.works, for example.
If you post a new comment, it won't leave your instance, but all the old posts/comments will still be there.
!unexpectediasip@sh.itjust.works
Aaand it's back!
I care about you! Please don't give up! ๐ซโฅ๏ธ