Backup

Implementing a robust backup regime is a non-negotiable requirement for ISO 27001 compliance, specifically within the framework of Annex A 8.13. As a Lead Auditor, I have seen many organisations fail their audits not because they lacked backups, but because they lacked the technical depth and evidence of restoration. Following this 10-step technical roadmap ensures your organisational data remains resilient, integral, and available following any security incident or system failure.

1. Formalise the Backup Policy and Scope

Establish the “Rules of Engagement” (ROE) by defining exactly what data requires protection and the frequency of those operations. This ensures that all critical information assets identified in your Asset Register are covered by your recovery strategy.

 
• Define Recovery Time Objectives (RTO) and Recovery Point Objectives (RPO) for every business-critical system.
 
• Document the “Rules of Engagement” for data owners regarding their responsibilities in the backup lifecycle.
 
• Map every item in your Asset Register to a specific backup profile.

2. Provision Secure and Redundant Infrastructure

Provision your storage architecture to include off-site or cloud-based replication. By separating the backup data from the primary production environment, you mitigate the risk of a single point of failure during a regional disaster or ransomware event.

 
• Utilise immutable storage solutions to prevent the unauthorised deletion or modification of backup sets.
 
• Ensure geographic separation between production data and backup storage locations.
 
• Provision cloud-native backup tools for SaaS and IaaS environments to ensure holistic coverage.

3. Implement Access Controls and Multi-Factor Authentication

Implement strict Identity and Access Management (IAM) roles to protect the backup management console. Unauthorised access to your backups is a primary target for attackers seeking to cripple your recovery capabilities.

 
• Assign dedicated IAM roles for backup administrators, separate from general system administration.
 
• Enforce Multi-Factor Authentication (MFA) for all accounts with permissions to modify backup schedules or delete data.
 
• Audit management access logs monthly to detect anomalous login attempts.

4. Configure Automation and Encryption Standards

Configure automated schedules to remove human error from the protection process. Simultaneously, ensure all data is encrypted at rest and in transit to maintain confidentiality, even if the backup media is compromised.

 
• Apply AES-256 encryption or higher for all backup sets stored in the cloud or on physical media.
 
• Configure automated verification scripts to check the completion status of every scheduled job.
 
• Rotate cryptographic keys regularly in accordance with your encryption policy.

5. Audit Integrity through Sandbox Restoration Testing

Audit the integrity of your backups by performing regular restoration tests in an isolated sandbox environment. A backup that has not been tested for restoration is a significant security risk and will result in a non-conformity during an audit.

 
• Execute a full restoration test at least quarterly for critical systems.
 
• Document the success or failure of restoration tests as evidence for your ISO 27001 auditor.
 
• Monitor the time taken to restore data to ensure it aligns with your documented RTO.

6. Enforce Retention and BCP Alignment

Enforce data retention schedules to comply with legal, regulatory, and organisational requirements. Finally, ensure your backup procedures are fully integrated into your broader Business Continuity Plans (BCP) and Disaster Recovery (DR) documentation.

 
• Automate the secure disposal of expired backup sets to prevent “data bloat” and legal liability.
 
• Link backup restoration procedures directly to your Disaster Recovery Plan (DRP).
 
• Review the entire backup regime annually to ensure alignment with changing business requirements.