That’s correct and that’s the problem. If a given community server goes down, that community basically just becomes an archive. It really needs to be able to continue without the host instance, similar to how a mesh works. Each remaining server routes around the dead node.
There is also the problem of search engine indexing… If a given server goes down, that information is lost to the search engine, even though it’s still on other nodes.
Which also leads to duplicate content problem for search engines, as ECU m each node of a given community contains the same information for a given post, making it crappy to index and search.
What do you mean “quickly?”