Question

A company runs a critical three-tier application on Azure VMs in the East US region. The application must survive a full regional outage with an RTO of under 2 hours and an RPO of 15 minutes. During a failover, the web, application, and database tiers must be brought online in a specific order (database first, then application, then web) with configurable time delays between groups. Which solution best meets these requirements?

Accepted Answer

Enable Azure Site Recovery replication for the VMs to a secondary region and use a recovery plan with multiple groups and pre/post scripts

Answer

Configure Azure Backup with cross-region restore and manually rebuild the VMs in the target region during an outage

Answer

Deploy a zone-redundant Virtual Machine Scale Set in East US with availability zones spread across the region

Answer

Create scheduled managed disk snapshots replicated to the secondary region and attach them to pre-provisioned VMs when needed