An unplanned failover is triggered from the recovery site when the primary site is unavailable because of an unexpected outage. Since the source environment is inaccessible, Azure Site Recovery cannot perform a final replication or graceful shutdown of the source VMs, so any data written after the last successful replication may be lost. Planned failover, by contrast, requires the primary site to be online so that it can finish replication and shut down the VMs cleanly before switching over.
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