I think the OP is asking / looking forward big tech like them to host the infrastructure for higher availability. Basically like a mirror. To end users they are

I think the OP is asking / looking forward big tech like them to host the infrastructure for higher availability. Basically like a mirror. To end users they are just the same server. On the side note, is the LE infrastructure globally distributed or currently all reside in US/West and/or US/East? Is Mozilla currently the one hosting?