I understand that even with a geo-replicated cluster if that cluster is configured with an online archive and there's a region outage, access to the online archive data is lost. It is still unclear to me if queries against collections configured with online would fail in this scenario. In any case, it would make sense to me to enable the S3 bucket backing the on-line archive to itself be replicated using "Amazon S3 Cross-Region Replication (CRR)"