Choosing a new instance?

So there's a possibility the instance I use will go offline. I've never had to think about this until now, but I want to choose a new instance and I'm wondering how this will affect things.

Certain instances have defederated from furry instances right? If I create an account on pawb.social for example, will I lose access to any particular communities? Is that a stable server running the latest version of Lemmy?