How to Implement the 3-2-1-1-0 Backup Strategy for Ransomware Resilience

Summary

A practical guide to 3-2-1-1-0 backups recommends an immutable copy, regular restore testing, encryption, separate credentials, MFA, and monitoring to improve recovery from ransomware and other disruptions.

Key points

• Keep three data copies on at least two media types, with one stored off-site.
• The 3-2-1-1-0 approach adds an immutable or air-gapped copy and regular testing to verify backups work.
• Inventory and classify critical data, then set backup frequency according to recovery point objectives.
• Use encryption, separate backup credentials, least privilege, and MFA to protect backup accounts and data.
• Test restores regularly, monitor backup jobs, and alert on unusual activity such as bulk deletions or authentication changes.
• Spread cloud backups across regions or providers to reduce reliance on a single location or platform.