I had a thing pinned to my Twitter once that said something like "host nothing yourself, but put things in public places and make sure they're easy to back up (and back them up)." I feel like I'm coming back to that idea, with things like Commons, Internet Archive, and Github central to how it works these days. The fediverse of course fits that idea. Even Flickr does, in a way. The general problem is one of interoperability, but the tradeoff is reduced fragility.
This is a Mastodon instance primarily for Australasian Galleries, Libraries, Archives, Museums and Records people, and anyone else who wants to hang out with them. We use the Hometown fork which enables local-only posts.