When you start the create replica workflow, a blank Azure Database for PostgreSQL server is created. The new server is filled with the data that was on the primary server. For creation of replicas in the same region snapshot approach is used, therefore the time of creation doesn't depend on the size of data. Geo-replicas are created using base backup of the primary instance, which is then transmitted over the network therefore time of creation might range from minutes to several hours depending on the primary size.
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