The difference between Azure Backup vs Azure Site Recovery is the problem each solves. Azure Backup creates point-in-time copies of data and workloads so you can restore files, databases or entire VMs after deletion, corruption or ransomware. Azure Site Recovery (ASR) continuously replicates virtual machines to another region or site so you can fail over and keep running during a major outage. Backup protects data; Site Recovery protects business continuity. Most organizations need both.
Key Takeaways
- Azure Backup = data protection with retention and point-in-time restore.
- Azure Site Recovery = replication and orchestrated failover for disaster recovery.
- ASR offers much lower RPO and RTO than restoring from backup.
- ASR does not replace backup, because replicated corruption or ransomware can also be replicated.
- Use recovery plans and regular DR drills to validate failover.
Comparison Table
| Factor | Azure Backup | Azure Site Recovery |
|---|---|---|
| Primary purpose | Restore data to a previous point | Fail over workloads to another site |
| Method | Scheduled snapshots and backups | Continuous replication |
| Typical RPO | Hours (based on backup frequency) | Minutes or less, depending on workload |
| Typical RTO | Hours to restore | Minutes to fail over |
| Retention | Days to years | Short recovery point history |
| Ransomware protection | Strong with immutable vaults and soft delete | Limited alone |
| Supported sources | Azure VMs, SQL, Azure Files, on-premises via agents | Azure VMs, Hyper-V, VMware, physical servers |
When to Use Azure Backup
- Recovering deleted or corrupted files and databases.
- Long-term retention for compliance.
- Ransomware recovery using immutable vaults.
- Protecting Azure Files, SQL in VMs and SAP HANA.
When to Use Azure Site Recovery
- Regional outages or datacenter failures.
- Critical apps requiring low downtime.
- Migrating workloads to Azure with minimal disruption.
- Planned failover testing without impacting production.
Designing a Combined Strategy
- Classify applications by business impact and set RTO and RPO targets.
- Protect all workloads with Azure Backup using immutable vault settings and multi-user authorization.
- Add Site Recovery for tier-1 applications that cannot tolerate long downtime.
- Build recovery plans that start systems in the right order.
- Run test failovers to an isolated network at least twice a year.
- Monitor backup and replication health continuously.
Cost Considerations
Azure Backup costs depend on protected instance size and storage consumed; ASR is billed per protected instance plus replicated storage and compute during failover. Review DR spend with your Azure FinOps program and avoid over-protecting low-impact systems.
See also our ransomware recovery plan guide for recovery priorities.
How Skytech Enterprise Helps
Our Azure Backup management and disaster recovery services design, implement and test protection for organizations in the USA and UAE. Request a DR review.
Frequently Asked Questions
Can Azure Site Recovery replace backup?
No. ASR replicates current state, including corruption or encryption. Backup provides historical, isolated restore points.
Does Azure Backup protect on-premises servers?
Yes. Azure Backup can protect on-premises Windows servers, files and some workloads through agents and Azure Backup Server.
What is an immutable vault in Azure Backup?
An immutable vault prevents backup data from being deleted or altered before its retention expires, helping protect against ransomware and malicious admins.
Can ASR fail over between Azure regions?
Yes. ASR supports replication and failover of Azure VMs between regions, as well as from on-premises to Azure.
How often should we test disaster recovery?
Run test failovers at least twice a year and after significant infrastructure changes.
Which is cheaper, Azure Backup or Site Recovery?
They serve different purposes, so costs are not directly comparable. Backup typically costs less per workload; ASR is reserved for systems needing fast failover.