How often should a disaster recovery plan be reviewed?

A disaster recovery plan should have a formal review at least once a year, supported by shorter operational checks throughout the year. The appropriate frequency depends on how quickly the organisation’s technology, risks and business requirements change. A plan for a stable environment may need less frequent full revisions than one supporting frequent system changes, multiple sites, cloud services or critical customer operations.

Separate a plan review from a recovery test. Reviewing the document checks whether its assumptions, contacts, procedures and priorities are still correct. Testing checks whether people can follow those procedures and whether the technical recovery process works in practice. Both activities are necessary. A plan can appear accurate but fail during a test because access details are wrong, dependencies have been missed or staff are unclear about their responsibilities.

A practical review cycle can include:

• Routine checks: confirm that contact details, supplier information, system inventories and access arrangements remain accurate.
• Periodic technical testing: verify that backups can be accessed and restored, recovery tools work as expected, and documented procedures reflect the actual environment.
• An annual formal review: reassess the full plan, including business priorities, recovery assumptions, dependencies, risks and approval by the relevant management team.
• Event-driven reviews: revisit the plan whenever a material change or incident could make its contents unreliable.

The review should examine more than the document itself. Compare the plan with the current technology environment and confirm that it includes the systems and information the organisation now depends on. This may include servers, cloud platforms, business applications, identity services, communications, network equipment, endpoint devices and data held by external providers. Check whether each dependency has a documented recovery method and whether the order of recovery still reflects the way the business operates.

Recovery priorities should also be reassessed. A system that was considered important when the plan was written may no longer be central to operations, while a newer platform may now support essential processes. Review the business impact of losing each service, the consequences of extended unavailability and any dependencies between systems. This helps ensure that recovery decisions are based on current operational needs rather than an outdated system list.

People and responsibilities require particular attention. Confirm that named roles still exist, that responsibilities are understood and that suitable deputies are identified. Contact information should be checked through an approved process rather than assumed to be correct. The plan should explain who can authorise recovery decisions, who communicates with staff and customers, who liaises with suppliers, and who records actions and decisions during an incident.

Backup arrangements should be reviewed as part of the wider recovery process. Confirm that the required data is included, that retention settings remain suitable, and that backups are protected from unauthorised alteration or deletion. A successful backup job does not by itself prove recoverability, so restoration evidence should be retained. Review whether restored data is usable, whether applications can operate with it, and whether recovery depends on credentials, encryption keys, licences or other resources that may not be available during an incident.

Changes that should normally trigger an additional review include:

• introducing, replacing or retiring a critical application;
• moving workloads between on-premises infrastructure and cloud services;
• changing backup technology, retention arrangements or storage locations;
• opening, closing or relocating a site;
• changing key suppliers, connectivity providers or managed service arrangements;
• reorganising teams or transferring responsibility for important systems;
• altering regulatory, contractual or data protection requirements; and
• experiencing a cyber security incident, significant outage or failed recovery exercise.

Every review should produce an auditable record. Record the date, participants, systems considered, findings, decisions, outstanding actions and the person responsible for each action. Give the plan a clear version number and approval status, retain previous versions where appropriate, and remove obsolete copies from locations where staff might rely on them. An action that is identified but never assigned or tracked does not improve recovery capability.

The review frequency should be risk-based rather than treated as a fixed administrative task. Organisations with complex infrastructure, rapid change, strict contractual obligations or high dependence on technology may need more frequent checks and testing. Smaller organisations still need a controlled review process, particularly where one person holds specialist knowledge or where recovery depends heavily on an external provider.

S2 Technology Group can help businesses assess whether their disaster recovery documentation reflects their current infrastructure, backup arrangements and security requirements. The objective is to keep the plan usable, evidence-based and aligned with how the organisation actually operates, rather than allowing it to become a document that is only consulted after a disruption.