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Azure - Geo-redundant storage

Geo-redundant storage (GRS) replicates your data to a secondary region that is hundreds of miles away from the primary region. If your storage account has GRS enabled, then your data is durable even in the case of a complete regional outage or a disaster in which the primary region is not recoverable.

For a storage account with GRS enabled, an update is first committed to the primary region, where it is replicated three times. Then the update is replicated to the secondary region, where it is also replicated three times, across separate fault domains and upgrade domains.
Note:
With GRS, requests to write data are replicated asynchronously to the secondary region. It is important to note that opting for GRS does not impact latency of requests made against the primary region. However, since asychronous replication involves a delay, in the event of a regional disaster it is possible that changes that have not yet been replicated to the secondary region may be lost if the data cannot be recovered from the primary region.
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