What is the MINIMUM standard for testing a disaster recovery plan (DRP)?

A semi-annual schedule tied to fiscal cycles imposes an arbitrary, calendar-driven cadence that ignores environmental changes and risk factors that may require more or less frequent testing.

Tying DRP testing frequency solely to audit department requirements subordinates a critical operational security control to an administrative function, which may result in insufficient testing during periods of high environmental change.

Quarterly testing may be excessive in highly stable environments and insufficient in rapidly changing ones; prescribing a fixed minimum interval based on a single advisor's recommendation does not reflect a proper risk-based approach.

The minimum standard for DRP testing is not defined by a fixed time interval but rather by the organization's risk environment, system changes, and business requirements. ISACA and NIST guidance emphasizes that testing frequency should increase when significant changes occur (new systems, infrastructure changes, personnel changes) and may decrease in stable, low-risk environments, making 'as often as necessary' the most accurate risk-based minimum standard.