The significance of data backup in disaster recovery plans lies in its ability to safeguard critical information against loss due to unforeseen events like hardware failures, cyberattacks, or natural disasters. Regular backups ensure that organizations can recover their data quickly, maintaining continuity of operations. A well-structured backup strategy minimizes downtime and protects against data corruption, allowing businesses to restore their systems and data to a functional state. This preventive measure is essential for compliance, financial stability, and customer trust.