Does DO copy updated data to every duplicate before return?

I have a question about CF durable-object.
It says it has redundant duplicates, but does it ensure strong consistency between duplicates? I mean, before return success to client, has it already copied updated data to every duplicates? Or it just ensure eventual consistency with duplicates. And in some emergent issues like earthquake, it can not ensure updated data are copied to duplicates.
By the way, I want to know how many copies does durable-object has.

2 posts were merged into an existing topic: Durable Object Duplicates