Encrypt backup data.

Best Practice: Encrypt Your Backups

Why It Matters

Encrypting backups ensures that even if someone gains access to your backup files, they can’t read or misuse the data without the encryption key. It’s an essential layer of defence in your cyber resilience strategy.

Best Practice Tips for Backup Encryption

1. Use Strong Encryption Standards

• Choose AES-256-bit encryption where available — it’s an industry standard for secure data protection.

• Avoid outdated algorithms like DES or unverified proprietary methods.

2. Encrypt at Source

• Encrypt files before transferring them to a backup destination (especially cloud services).

• Use backup tools that offer built-in encryption during the backup process.

3. Protect Your Encryption Keys

• Store encryption keys separately from the backup data.

• Use a hardware security module (HSM) or a secure key management system.

• Avoid embedding passwords or keys in scripts or software.

4. Cloud Backup Considerations

• Choose a cloud provider that offers end-to-end encryption and complies with standards like ISO 27001 or GDPR.

• Confirm whether encryption is handled client-side, server-side, or both.

5. Local Backup Encryption

• If storing on external drives or NAS devices, ensure disk-level encryption (e.g., BitLocker, FileVault, or VeraCrypt).

• Physically secure the storage devices to prevent theft.

6. Regularly Test and Rotate Keys

• Periodically test encrypted backups to confirm they can be restored.

• Rotate encryption keys periodically and after any suspected breach.

7. Document Your Encryption Strategy

• Maintain documentation of:

  • The encryption tools used

  • Key storage procedures

  • Access permissions and roles