Backup Encryption for Small Businesses

Backup files contain everything a business needs to operate — financial records, customer data, employee files, and email. If that backup falls into the wrong hands, the damage can be as severe as a primary data breach. Encryption makes backup files unreadable without the decryption key.

Encryption should cover two states:

- At rest. Backup files stored on disks, tapes, or cloud object storage should be encrypted so physical theft or unauthorized storage access does not expose data.

- In transit. Data moving from your office to an offsite or cloud backup destination should be encrypted over TLS or a VPN so it cannot be intercepted.

Key management matters as much as encryption:

- Store encryption keys separately from the backup data they protect.

- Rotate keys on a defined schedule.

- Document who can access keys and under what circumstances.

- Never store backup keys on the same system being backed up.

Losing an encryption key is as bad as losing the data. Have a documented recovery process for keys, and test it before you need it.