Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You are designing a disaster-recovery strategy for an Azure virtual machine that hosts a mission-critical SQL Server 2022 instance. The VM is deployed in the East US region. The business requires that, in the event of a complete regional outage, the VM (including its operating system and application data) can be made available in the paired region within two hours, with no more than 15 minutes of data loss. The solution must minimize ongoing administrative effort and must not rely on custom backup-copy scripts.
Which approach meets these requirements?
Use Azure Backup for SQL in Azure VM with 15-minute log backups stored in locally redundant storage (LRS) and rely on an availability set for high availability.
Set up SQL Server automated backups with 15-minute transaction log backups to Azure Storage and manually recreate the VM in the secondary region when needed.
Configure Azure Backup to protect the VM in a Recovery Services vault that uses geo-redundant storage (GRS) and enable cross-region restore.
Enable Azure Site Recovery to replicate the VM to the paired region with continuous replication and plan a recovery plan for failover.
Azure Site Recovery (ASR) continuously replicates the entire virtual machine-operating system disks, data disks, and all application data-from the primary region to the paired secondary region. ASR provides crash-consistent replication points typically seconds apart, ensuring an RPO that is well within the 15-minute limit. A planned or unplanned failover can power on the replica VM in the secondary region within minutes, so the two-hour RTO is also satisfied. After the initial setup, ASR automatically handles replication and retention, so ongoing management is minimal.
Using Azure Backup with geo-redundant storage creates daily or weekly VM restore points; even with cross-region restore enabled, the maximum backup frequency limits the achievable RPO to several hours or a full day. Snapshot-based solutions copied manually to another region do not meet the management or RTO requirements. Backing up only SQL databases with 15-minute log backups protects data but does not safeguard the operating system or provide automated VM failover, and locally redundant storage offers no regional resiliency. Therefore, enabling Azure Site Recovery replication for the VM is the only option that satisfies all requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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