What the plan is for
A disaster recovery plan is a written set of instructions for getting technology services working again after a major disruption: a failed storage system, a building loss, a serious cyberattack, a prolonged power or network failure. It is written in advance because decisions made during a crisis are slower, more stressful and more error-prone.
The plan is about technology. How the wider organization keeps operating while systems are down is a separate and larger subject, covered under business continuity. A disaster recovery plan is usually one component of that broader effort.
Define the scope
Begin by stating what the plan covers. Which systems, sites and services are included? Which kinds of events? A plan for “everything” tends to end up detailed about nothing. It is often better to start with the systems the organization could least afford to lose and extend from there.
Alongside scope, list assumptions. For example, the plan might assume that backups are intact, that a staff member with the right access is reachable, or that internet service is available. When an assumption fails, people need to know the plan may not work as written.
List and rank your systems
Create an inventory of the systems that matter, who owns each one, what it depends on and what depends on it. Dependencies are easy to miss. A line-of-business application may need a database, a directory service for sign-in, a network path and a licensing server, and recovery has to happen in a sensible order.
Then rank the systems by how quickly they must return. A risk assessment helps by linking likely threats to their business impact. For each system, record two targets: how long it can be down and how much recent data can be lost. These are the recovery objectives, and they decide how much effort and money each system deserves.
Record the recovery steps
For each priority system, write procedures that someone competent but unfamiliar with the details could follow. Typical contents include:
- Where the backups or replicas are stored and how to reach them
- The order in which components are restored
- Where to restore to, such as spare hardware, virtual machines or a cloud environment
- Required configuration, licenses and credentials, or where to find them
- How to confirm the service is working before handing it back to users
Being able to rebuild from scripts and stored definitions, as with infrastructure as code, can shorten this part considerably, and good configuration management records make it easier to recreate settings correctly. Where setup was done by hand, write the steps down now.
Assign roles and contacts
State who declares a disaster, who leads recovery, who handles communication and who makes spending decisions. Name backups for each role, since people are on vacation or unreachable more often than plans assume. Include contact details for staff, key suppliers, internet and hosting providers, and any outside support. Print or store a copy somewhere that does not depend on the systems that have failed.
Where an event is a security incident rather than a simple failure, the plan should point to the incident response procedures, because evidence handling and containment may come before restoring anything. Restoring too quickly can reintroduce the very problem that caused the outage.
Plan communication
Decide how you will tell staff, customers and partners what is happening, and who approves what is said. Prepare simple holding statements. Agree on an alternative channel in case email or chat is down. Consistent, honest updates reduce confusion and repeated calls to whoever is busiest restoring services. Obligations to notify regulators or affected individuals may apply in some situations, so check with the people responsible for compliance rather than assuming.
Cover alternative arrangements
Think about what staff will use to work in the meantime. Possibilities include remote access, borrowed or spare equipment, a secondary location, or manual workarounds for a few days. Also consider suppliers: if you rely on an outside provider, review what their service level agreements actually promise about recovery.
Test and maintain the plan
An untested plan is mostly a guess. Testing can range from reading through the document together, to a tabletop exercise where a scenario is talked through, to actually restoring a system into a separate environment. Each test should produce a short list of things to fix. Good restore testing of the underlying backups is the foundation, since every step of the plan depends on them.
Keep the plan current. Review it at least periodically and after major changes such as new systems, a move to a new provider or staff changes. Use a simple version history so everyone knows which copy is current, and store copies where they can be reached during an outage. After any real incident or exercise, a post-incident review is an ideal moment to update it.
Keep it usable
Long documents are rarely read under pressure. Use short sections, checklists and clear headings, put the most urgent steps first, and avoid jargon that only one person understands. A modest plan that people can follow is worth more than an elaborate one nobody opens. No plan removes all risk, but a clear one narrows the gap between a bad day and a long recovery.