Sure, it won't offer exactly the same affordance but the OP mentioned rare downtimes like electricity going out (rare here is used generously, obviously some places see this happen often).

Providing a read-only, static version of the services, particularly toots and blog posts, while the origin is unreachable is straightforward and inexpensive.

Somewhat related, the Solar Protocol [0] does something like this to host websites across an array of solar-powered servers across the globe. http://solarprotocol.net/