- If you opt in "within a region and geo-pair" in data residency configuration of the Azure Event Grid topics and domains, event subscription configuration data, also known as "metadata" will be replicated to a predefined secondary region. This allows Microsoft-initiated failover to the paired region if a failure occurs in a region. See [Azure cross-region replication pairings for all geographies](../availability-zones/cross-region-replication-azure.md#azure-cross-region-replication-pairings-for-all-geographies) to learn more about the supported paired regions. Otherwise, if you opt in "within a region", no data of any kind is replicated to another region by Microsoft. You may define your own disaster recovery plan. For more information, see [Build your own disaster recovery for custom topics in Event Grid](custom-disaster-recovery.md).
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