If you opt in "cross-geo" 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-paired-regions) to learn more about the supported paired regions. Otherwise, if you opt in "regional", no data of any kind is replicated to another region by Microsoft. You may define your own disaster recovery plan.
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