A recovery plan that has never been tested is an assumption, not a safeguard. Your backups may exist, cloud systems may be documented and staff may know whom to call, but none of that proves your business can continue after ransomware, a server failure or a major supplier outage. Knowing how to test a disaster recovery plan gives you evidence that your people, technology and decisions will hold up when time is limited.

For small and growing businesses, testing does not need to mean shutting down the office for a day or recreating a full-scale crisis. It means running controlled, realistic checks that expose gaps before an incident exposes them for you.

Start with the business services you must restore

A disaster recovery test should begin with the services that keep the organisation operating, rather than a generic list of IT equipment. Identify what would prevent staff from serving customers, taking payments, accessing records or communicating with suppliers. For one business, the priority may be a cloud accounting platform and email. For another, it may be a line-of-business database, remote access and warehouse connectivity.

For each priority service, agree two practical targets. The recovery time objective (RTO) is the longest acceptable period of downtime. The recovery point objective (RPO) is the maximum amount of data the business can afford to lose. If your RPO is four hours, for example, a successful recovery must restore data that is no more than four hours old.

These targets should be set by business leaders, not IT alone. Restoring every system immediately is expensive and often unnecessary. The purpose is to make deliberate trade-offs: protect the most valuable operations first, then restore less critical services in a controlled order.

Choose a test that matches the risk

There is no single correct way to test a disaster recovery plan. The right approach depends on your systems, contractual commitments, available resources and tolerance for disruption. Most organisations benefit from building up through several levels of testing.

Review the plan on paper

A walkthrough brings together the people responsible for IT, operations, communications and leadership. Take a realistic event, such as a ransomware attack that encrypts a file server, and talk through the response from the first alert to full recovery.

This is the simplest test, but it is valuable. It reveals outdated contacts, unclear authority, missing supplier details and assumptions such as “the backup administrator will handle it”. Ask who can authorise downtime, who speaks to customers, who has access to recovery credentials and what happens if a key person is unavailable.

Run a tabletop scenario

A tabletop exercise is a structured discussion where the situation changes as the session progresses. Perhaps suspicious activity is found on a user account, then the identity platform becomes unavailable, then a client asks whether their information has been affected.

The goal is not to catch people out. It is to test decision-making, escalation and communication under pressure. Include non-technical colleagues, because a technically correct recovery can still fail the business if staff do not know how to work around disruption or customers receive conflicting information.

Test backups and individual restores

A backup report only confirms that a job completed. It does not confirm that the data is complete, uncorrupted, accessible or recoverable within your RTO. Regularly restore a representative sample of files, databases, virtual machines and cloud data into an isolated environment.

Check the restored data with the people who use it. A database may start successfully but contain records that are too old, incomplete or unusable. Record the time taken from requesting the restore to making the information available, then compare it with the agreed recovery target.

Carry out a technical recovery exercise

A technical exercise restores a service, system or workload into a separate recovery environment without affecting live operations. This may include rebuilding a server from an image, failing over a cloud workload, recovering a database or providing staff with alternative access to essential applications.

This is where hidden dependencies appear. A restored application may depend on DNS, licences, multi-factor authentication, firewall rules, certificates or an external provider. Test the complete service journey, not simply whether a server is switched on.

Build a realistic test scenario

The most useful tests are specific enough to reflect how disruption would affect your organisation. “The system is down” is too vague. A better scenario identifies what failed, what remains available and what constraints apply.

For example: a member of staff opens a malicious attachment on a Friday afternoon. The security team isolates affected devices, but the shared drive and a business-critical server may have been encrypted. The latest backup completed overnight, the main contact is on leave and customers need an update before close of business.

That scenario tests more than recovery technology. It tests incident containment, access to clean backups, decision rights, customer communication and the ability to work safely while systems are unavailable. It also reflects a key reality of cyber recovery: restoring data before the source of compromise is contained can reintroduce the same threat.

Keep the scope proportionate. A small business may test one essential application and its data each quarter, while a larger organisation might rotate through critical services and conduct an annual end-to-end exercise. Frequency matters, but relevance matters more. Test after major changes to infrastructure, cloud platforms, backup tools, key suppliers or working arrangements.

Measure what happened, not what was intended

During the exercise, appoint someone to keep a simple record of timings, decisions, problems and workarounds. The record should show when the incident was identified, when recovery began, when systems were usable and whether the restored data met the RPO.

Also capture operational outcomes. Could staff access the instructions? Did the escalation process work outside normal hours? Was the right person authorised to approve recovery? Did the team know which customer or regulatory communications were required? These details often determine whether downtime is manageable or damaging.

A test is not a pass simply because a system was recovered eventually. It passes when the agreed service is restored safely, within acceptable time and with an acceptable level of data loss. If it does not meet those conditions, the result is still useful. It has shown exactly where investment, documentation or process changes are needed.

Turn findings into an improvement plan

Every test should end with a short review while details are fresh. Separate findings into immediate fixes, planned improvements and accepted risks. An expired administrator account or missing mobile number should be corrected straight away. A recovery process that exceeds the RTO may require a larger decision, such as more frequent backups, a different cloud architecture or a revised service priority.

Assign an owner and due date to each action. Without this step, disaster recovery testing becomes a reassuring exercise that changes little. Update the plan, recovery runbooks and contact lists, then confirm that the next test will verify the changes.

It is also wise to keep evidence of tests and improvements. This supports governance, customer assurance and cyber insurance discussions, but it has a more practical benefit: new staff and external specialists can understand how the recovery process works and what has already been proven.

Common mistakes to avoid when testing a disaster recovery plan

The most common mistake is testing only the backup platform. Recovery depends on people, identity access, networks, applications, third parties and clear communications. Another is using an overly convenient scenario where every key person is available and the incident occurs during office hours.

Avoid performing a live failover without proper planning. Some systems are sensitive to changes in data replication, network routing or application state. Where a full failover could affect customers, use an isolated environment first and involve the relevant suppliers. The aim is confidence, not unnecessary disruption.

Finally, do not treat a successful test as permanent proof. Technology, staff and business priorities change. A plan that worked six months ago may no longer reflect your cloud estate, security controls or critical processes.

A well-tested recovery plan gives leaders more than a technical checklist. It provides a realistic view of what the business can withstand, where the weak points are and who will act when normal operations stop. Start with one critical service, test it carefully and use the results to make the next recovery faster, safer and easier to manage.