I hate to be that guy, but celld does essentially the same thing, no? It waits until relocated to another node, or stored in S3, and unless something has gone wrong, this will essentially always be storing to the other node first. (Admittedly, I recall it used to be just replicating to 1 node was considered stored, and if that went down it could be lost. I think it's two now, or at least the bug is filed)