Building blocks
Design goal
Make backup deletion materially harder for compromised or over-privileged identities while preserving a recovery process that can meet the required RPO and RTO.
Success criteria
- Apply policy-based backup and retention
- Protect recovery points with immutability
- Separate backup administration from workload administration
- Prove recoverability through restore testing
Architecture
Back up supported workloads into a Recovery Services vault or Backup vault, enable immutability according to the support matrix, and combine retention controls with least privilege, monitoring, and recovery testing.
Architecture flow
- Protected workload
- Backup policy
- Azure Backup vault
- Immutable recovery points
- Restore validation
Architecture decisions
Lock only after retention is understood
WhyA locked immutable configuration is intentionally difficult or impossible to reverse, so retention and operational procedures should be validated before irreversible protection is enabled.
Trade-offImmutability protects recovery points, but irreversible settings can also preserve unwanted data or retention mistakes longer than intended.
Immutability complements, not replaces, recovery testing
WhyProtected recovery points are valuable only if the organization can restore them within the required recovery objectives.
Trade-offProtected backups improve resilience, but restore testing consumes capacity and operational time and may expose application-level recovery gaps.
Security
Protect the control and data paths deliberately. Use least-privilege Azure RBAC, protect privileged roles, monitor backup-security events, and keep restore procedures available through a primary-environment outage.
Availability
Design for the failure domain that must be survived. Backup vault resilience and redundancy should match the failure scenarios the protected workload must survive.
Disaster recovery
Treat regional recovery as a separate operating state. Use backup copies and vault redundancy as part of the recovery design; workload-specific replication or regional DR may still be required for tighter RPO/RTO.
Cost drivers
- Protected instance size and type
- Backup storage consumed
- Retention duration
- Redundancy selection
- Restore and cross-region requirements
Design assumptions
- The selected workload and region support required Azure Backup features
- Retention requirements are approved before irreversible locking decisions
Implementation plan
- Classify workloads into recovery tiers with agreed backup frequency, retention, and restore objectives.
- Create or select the Recovery Services/Backup vault and separate backup administration from day-to-day workload operations where required.
- Configure policy schedules and retention before enabling immutability so the protected retention model is deliberate.
- Test the policy and role model, then enable the intended immutability state and document any irreversible controls.
- Configure failed-job and security alerts, and perform scheduled restores of representative workloads rather than validating backup jobs only.
Validate the design
- Attempt a controlled prohibited deletion or retention change and confirm immutability behaves as intended.
- Restore representative workloads and verify application/data usability, not only restore-job success.
- Measure actual recovery time against the workload tier RTO.
- Review protected retention, access roles, and alerts against current compliance and cost requirements.