Implement security controls to protect backups

Enforce Backup Vault Compliance with Azure Policy and Defender for Cloud

Vault Governance and Policy Enforcement

Azure Policy and Microsoft Defender for Cloud work together to safeguard Recovery Services vaults against configuration drift and security gaps. Administrators assign policy initiatives to automatically audit vault configurations, blocking non-compliant deployments or triggering automatic remediation. Defender for Cloud constantly evaluates these vaults against security baselines, generating recommendations that help maintain a strong security posture. These platforms ensure that every deployed backup vault automatically aligns with organizational governance standards without manual intervention.

Encryption and Key Management

To protect backup data from unauthorized access, organizations can choose between different encryption models. By default, Azure secures data at rest using platform-managed keys (PMK). For greater control over the lifecycle of the keys, organizations can implement customer-managed keys (CMK) stored securely in Azure Key Vault. To achieve double encryption at the physical layer, administrators can enable infrastructure-level encryption. During transit, data is protected using Transport Layer Security (TLS) as it moves between the protected resources and the vault.

Access Control and Data Deletion Protection

Securing backup data requires a strict combination of administrative barriers and recovery mechanisms. Implementing Role-based access control (RBAC) ensures that users receive only the minimum necessary permissions to perform their backup duties. To prevent accidental or malicious deletion of backup data, organizations can apply Resource Locks or configure immutable vaults to block any modification of recovery points. For critical operations like disabling backup protection, Multi-user Authorization (MUA) uses a Resource Guard to require a separate approval step from a different administrator. Additionally, Soft Delete ensures that even if backup data is deleted, it remains recoverable in a temporary state for 14 days.

Monitoring, Alerting, and Incident Response

Continuous monitoring ensures that security teams can quickly detect and respond to suspicious activities. Administrators must configure Diagnostic Settings on each vault to send resource logs directly to an Azure Monitor Log Analytics workspace. From there, log data flows to Microsoft Sentinel to enable real-time threat detection and security analytics. When Defender for Cloud flags an anomaly, such as an unusual volume of restores, Sentinel can run automated playbooks to isolate resources or alert security personnel. This integrated loop of logging, detecting, and responding creates a highly resilient backup environment.