Backup and Disaster Recovery in Azure

Backup and DR are not the same thing

Many people use "backup" and "disaster recovery" as synonyms, and that confusion is costly during an incident. Backup is about recovering lost or corrupted data — restoring a file, a database, or a server to an earlier point in time. Disaster recovery (DR) is about recovering the operation when an entire site goes down — bringing everything up in another region and continuing to work. You need both, and they use different tools in Azure.

As a Microsoft partner and CSP, RHC helps design this protection based on two metrics that define everything: RPO and RTO.

RPO and RTO: the metrics that define the project

Before choosing technology, define the business objectives:

• RPO (Recovery Point Objective) — how much data you can afford to lose, measured in time. A 1-hour RPO means accepting the loss of, at worst, 1 hour of work.
• RTO (Recovery Time Objective) — how long you can be down before restoring operations.

The smaller the RPO and RTO, the higher the solution's cost. The project's job is to match these targets to the value of each workload — a critical billing system demands very low RPO/RTO; an internal file server tolerates more.

Azure Backup: data protection

Azure Backup protects virtual machines, SQL databases, files, and on-premises workloads, storing recovery points in a Recovery Services Vault. Features that matter:

• Configurable retention — from days to years, to meet policy and compliance.
• Incremental backup — only changes are sent, saving storage.
• Granular restore — recover a single file or the entire VM.
• Geo-redundancy — copies in another region to survive regional failures.

Ransomware protection

Backup has become the last line of defense against ransomware — and attackers know it, so they try to delete backups first. Azure Backup offers specific defenses:

• Soft delete — deleted backups remain recoverable for a period even after deletion.
• Immutability — recovery points that cannot be altered or deleted during retention.
• Multifactor authentication for critical delete operations.
• Alerts for suspicious vault activity.

A backup the attacker can delete is not a backup. Immutability is what guarantees recovery after an attack.

Azure Site Recovery: operational continuity

When the goal is to survive the loss of an entire site, Azure Site Recovery (ASR) comes in. It continuously replicates virtual machines to another region (or from on-premises to Azure) and enables orchestrated failover: with a few clicks, your operation comes up in the secondary region.

Key ASR capabilities:

• Continuous replication with low RPO.
• Recovery plans that define the boot order of systems (database before application, for example).
• Failover testing without affecting production — essential to validate DR without waiting for a disaster.
• Failback to return to the original region after normalization.

The mistake of never testing

The biggest DR risk is not lack of tooling — it is the plan that was never tested. A DR that exists only on paper tends to fail exactly when needed. Best practices:

1. Periodic failover testing, at least twice a year.
2. Living documentation of recovery plans.
3. Defined owners to trigger and validate.
4. Review after architecture changes.

Checklist / Key takeaways

• Backup recovers data; DR recovers operations — you need both.
• Define RPO and RTO per workload before choosing technology.
• Use Azure Backup for data protection with retention and immutability.
• Enable soft delete and immutability against ransomware.
• Use Azure Site Recovery for orchestrated cross-region failover.
• Test failover periodically — untested DR is not DR.

Well-designed data protection and continuity turn a potential disaster into a controlled setback. RHC sizes backup and DR to the real value of each system, balancing cost and resilience.