ISO 27001 Annex A 5.30 ICT readiness for business continuity requires organisations to keep technical systems resilient and recoverable. Documented continuity plans ensure communication tools, data networks, and core systems recover quickly after major disruptions.
Table of contents
Key Takeaways
- Ensure technical resilience: Plan and build technical systems to withstand major outages, cyber attacks, and natural disasters.
- Store continuity plans centrally: Keep disaster recovery runbooks, architecture maps, and supplier lists in a central document repository.
- Define clear recovery targets: Set maximum tolerable downtime and data loss limits for every critical business system.
- Build system redundancy: Implement duplicate network paths, secondary power units, and distributed data hosting to avoid single failure points.
- Test recovery procedures regularly: Conduct practical disaster recovery drills to verify that backup systems restore data within agreed timeframes.
- Maintain reliable backups: Run frequent data backups and store secondary copies in isolated, secure off-site locations.
- Review supplier continuity: Confirm that external cloud and infrastructure providers maintain matching uptime and resilience commitments.
- Support continuous improvement: Update recovery steps and technical infrastructure after every continuity test or real outage event.
How to Implement ISO 27001 Annex A 5.30
- Draft an ICT continuity plan: Write a documented technical recovery plan and store it in your central document repository.
- Run business impact analyses: Identify critical software, systems, and communications required to keep business operations alive.
- Set recovery time and point targets: Define exact target recovery hours and allowable data loss points for all core applications.
- Deploy redundant infrastructure: Use duplicate hardware, spare power feeds, and separate network links for vital services.
- Automate failover processes: Configure technical tools to switch network traffic to backup environments automatically during disruptions.
- Protect and isolate backups: Keep offline or immutable backup snapshots to protect recovery points against ransomware corruption.
- Schedule annual recovery tests: Run full failover tests and desktop simulation drills to validate recovery steps once per year.
- Train response teams: Ensure technical engineers understand their emergency roles, escalation contacts, and restoration duties.
- Update plans after changes: Review recovery documents whenever major network builds, system migrations, or tool changes occur.
When you’re ready to bring compliance into one place
How to Audit ISO 27001 Annex A 5.30
- Review continuity documentation: Inspect written technical recovery plans to verify alignment with overall business continuity objectives.
- Verify recovery target metrics: Confirm that recovery time and data loss targets are documented and approved by business leaders.
- Inspect recovery test logs: Review recent disaster recovery test reports to verify that systems met recovery targets during drills.
- Check infrastructure redundancy: Inspect system architecture diagrams to confirm critical services have no single points of failure.
- Audit backup restoration records: Sample backup logs to ensure data copies restore successfully without corruption.
- Review supplier service levels: Check contracts with hosting and software vendors to verify their uptime and recovery guarantees.
- Verify staff emergency roles: Interview key technical staff to confirm they know how to access runbooks and execute recovery tasks.
- Inspect corrective action logs: Check that teams resolved weaknesses identified during previous continuity drills.
Audit Evidence Checklist
- ICT continuity policy: Maintain a documented ICT readiness and disaster recovery policy with version history in your central repository.
- Business impact assessment reports: Provide signed records defining critical technical services and recovery priorities.
- System architecture diagrams: Supply network topologies showing backup paths, failover zones, and hardware redundancy.
- Disaster recovery test reports: Provide results, timestamps, and lessons learned from completed system failover drills.
- Backup verification logs: Supply audit records proving daily backup success and periodic restore integrity tests.
- Third-party vendor agreements: Maintain contracts and service level agreements confirming provider continuity readiness.
- Emergency contact lists: Keep up-to-date call trees and escalation registers for key technical recovery staff and vendors.
What to Teach Employees
- Know emergency contacts: Teach workers how to report severe technical outages and reach emergency incident coordinators quickly.
- Follow backup routines: Instruct staff to store business files in approved repositories that receive automatic daily backups.
- Understand recovery priorities: Educate teams on which core business functions recover first during a major IT failure.
- Use secondary communications: Train staff to switch to approved secondary communication channels if primary networks go down.
- Participate in continuity drills: Encourage operational teams to take part in recovery rehearsals to build confidence and readiness.
- Protect offline recovery data: Remind staff never to disable backup tools or tamper with standby recovery systems.
Common Implementation Challenges
- Untested recovery runbooks: Teams write disaster recovery plans but never test them. Schedule mandatory annual failover drills.
- Unrealistic recovery targets: Setting near-zero recovery windows creates excessive infrastructure costs. Match targets to true business needs.
- Single points of failure: Hidden dependencies on single routers or power units cause outages. Conduct regular architectural risk reviews.
- Overlooking cloud dependencies: Teams assume cloud vendors manage all backups automatically. Configure and verify client-side backup routines.
- Outdated recovery guides: System changes render existing recovery steps obsolete. Update runbooks whenever infrastructure changes occur.
- Unprotected backup stores: Online backups get encrypted by malware during cyber attacks. Use immutable or isolated off-site copies.
How to Measure Effectiveness (KPIs)
- Recovery time actuals: Measure the actual time taken to restore critical systems during tests compared to target recovery times.
- Recovery point actuals: Track the amount of data lost during restore tests compared to allowable data loss limits.
- Continuity test completion rate: Track the percentage of critical systems that undergo formal recovery drills each year.
- Backup restoration success rate: Measure the proportion of sample data restores completed successfully without errors.
- Critical system uptime rate: Track overall service availability percentages for primary customer-facing and business platforms.
- Continuity audit finding count: Monitor the number of non-conformities raised against ICT readiness during internal audits.
Related ISO 27001 Controls
ISO 27001 Control A 5.30 connects to several other ISO 27001 requirements:
- Annex A 5.29: Information security during disruption.
- Annex A 8.13: Information backup procedures.
- Clause 6.1.2: Information security risk assessment.
