Disaster Recovery

Disaster recovery (DR) ensures business continuity by restoring technology systems after catastrophic events like cyberattacks, natural disasters, or infrastructure failures.

Why it matters

• Extended downtime can cost businesses $5,600+ per minute on average.
• Ransomware attacks make DR planning essential for every organization.
• Compliance frameworks require documented DR procedures.
• Customer expectations demand minimal service disruption.

Key metrics

• RTO (Recovery Time Objective): Maximum acceptable downtime—how fast must you recover?
• RPO (Recovery Point Objective): Maximum acceptable data loss—how recent must your backup be?
• MTTR (Mean Time to Recovery): Average actual recovery time.
• MTPD (Maximum Tolerable Period of Disruption): Point where business impact becomes unacceptable.

DR strategies (by RTO)

• Backup and restore (hours/days): Restore from backups to new infrastructure.
• Pilot light (minutes/hours): Core systems running in standby, scale up when needed.
• Warm standby (minutes): Scaled-down copy of production ready to scale up.
• Multi-site active/active (seconds): Traffic served from multiple locations simultaneously.

Essential components

• Data backup: Regular, tested backups with offsite/cloud copies.
• Documentation: Runbooks, contact lists, vendor information.
• Communication plan: How to notify stakeholders during outages.
• Alternative sites: Hot/warm/cold sites for operations.
• Testing: Regular DR drills to validate procedures.

Cloud DR considerations

• Multi-region deployments for resilience.
• Infrastructure as Code for rapid reconstruction.
• Database replication across availability zones.
• Automated failover mechanisms.
• Cost-benefit analysis of always-on standby vs. on-demand recovery.