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Postgres across clusters For Postgres to work across clusters we do need to have the data being synchronized. With some other databases we do have some master-master approach, but usually have very strict requirements on latency, bandwidth, etc that we cannot solve with On-Premise + external cloud providers. If the replication is based on the storage level instead, then you face that database servers don’t deal well if the data changes underneath it, so it leads to data corruption, on top of the storage-level issues/requirements as well on bandwidth, latency, etc. ...