If a data breach occurs, businesses should: 1. Contain the breach: Immediately take steps to prevent further data loss. 2. Investigate: Determine the cause of the breach and the extent of the damage. 3. Notify affected parties: Inform customers, employees, and regulatory bodies as required by law. 4. Remediate: Fix the vulnerabilities that led to the breach to prevent future incidents. 5. Review and improve: Assess the incident response and make necessary improvements to security measures and policies.