Azure Site Recovery allows recovering on-premises, Azure or third party cloud virtual machines into Azure. It works by replicating VM disks into a storage account (in a different region to the production environment if performing Azure-Azure ASR). On failover, ASR will attach these disks to virtual machines.
ASR offers a 15 minute RPO and support for app-consistent recovery points, ensuring captured recovery points are "valid" and don't contain corrupt or incomplete data.
Upon replication configuration it'll create an
-asr suffixed resource group in which it'll duplicate storage resources. ASR supports both managed and unmanaged disks.
It operates via a failover and fail-back approach between two regions. During failover and fail-back operations it can perform fix-up operations of its own selection or via Azure Automation runbooks.