Explanation
Testing a disaster recovery plan regularly and keeping it up to date is essential to ensure that the measures taken and the incident procedures planned are adequate and effective in the event of a disaster6. A disaster recovery plan is a documented set of actions and arrangements to enable an organization to respond to a disaster affecting its information assets and resume its critical activities within a defined time frame7.
However, a disaster recovery plan may become obsolete or ineffective due to changes in the organization's environment, operations, risks, or resources. Therefore, testing the plan periodically and updating it accordingly is necessary to verify its validity, feasibility, completeness, and accuracy6. References: ISO/IEC
27031:2011, clauses 7.4 and 8.3; ISO/IEC 27000:2022, clause 3.11.