The biggest problem is that the snapshot mechanism would need to traverse multiple data centers. The current arch uses the disk for storage in several ways which aren't easy to fix, and because of the way several of the plugins were built (with lots of the nastiest custom code I've ever seen) each time I start experimenting I run into weird breakage and debugging hell. Enough so that I decided it's not worth it for HA at this point. Will be rebuilding much of it in Elixir/Phoenix though, and that will be 12 factor/HA[1] from the start.

[1]: Me explaining 12 factor for anyone not familiar already (and I've actually had people who were well experienced with 12 factor tell me they got a lot out of this video): https://www.youtube.com/watch?v=REbM4BDeua0