Disaster recovery design · Burlington, Ontario
Disaster Recovery Design for Burlington Organizations
Disaster recovery is the documented, tested capability to bring systems back into operation after a major disruption — a defined sequence, a recovery time objective per system, and infrastructure that exists before it is needed rather than being improvised during an outage.
What this covers
- Recovery time objective set per system, not organization-wide
- Documented restoration sequence and dependencies
- Alternate infrastructure ready before it is required
- Runbooks written for execution under pressure
- Aligned to NIST SP 800-34 contingency planning
01Design principles
Sequencing matters more than speed
A disaster recovery plan that restores the wrong system first, or restores a system before the infrastructure it depends on, fails regardless of how fast any individual step runs.
NIST SP 800-34 structures contingency planning around a business impact analysis: identify which systems support which business functions, the maximum tolerable downtime for each, and the dependencies between them. Network connectivity and directory services typically restore before the applications that depend on them, and that sequence is documented rather than assumed.
Recovery time objective and recovery point objective are set per system based on that impact analysis, not applied uniformly. A payroll system and an archival file share do not warrant the same investment in recovery infrastructure, and treating them identically wastes budget on one and under-protects the other.
Alternate infrastructure — standby virtual machines, cloud failover capacity, or a secondary site — is provisioned in advance and kept current with production, because a disaster recovery plan that references outdated configuration adds time to an already time-pressured event.
02What disaster recovery design covers
Scope of DR planning
Documentation and infrastructure decisions made before an incident, not during one.
- Business impact analysis and system prioritisation
- Recovery time objective per system
- Recovery point objective per system
- Dependency mapping between systems
- Alternate site or cloud failover design
- Standby infrastructure provisioning
- Network and DNS failover planning
- Step-by-step recovery runbooks
- Roles and responsibilities during activation
- Communication plan during an active event
- Vendor and circuit dependency documentation
- Annual plan review and update cycle
03How a plan is built
From business impact to executable runbook
A disaster recovery plan is only as good as its weakest documented step.
Business impact analysis
Every critical system is assessed for the operational and financial impact of downtime, establishing the recovery time and point objectives that drive every subsequent design decision.
Recovery sequencing
Dependencies are mapped so infrastructure, identity and network services restore before the applications that rely on them, avoiding failed restores caused by out-of-order recovery.
Alternate infrastructure
Standby capacity, whether cloud-based failover or a secondary site, is provisioned and kept synchronised with production configuration and patch level.
Executable runbooks
Recovery steps are written for whoever is available during the event, with credentials, contacts and commands documented rather than held in one engineer's memory.
Activation authority
Who declares a disaster, who authorises failover, and who communicates with stakeholders is decided in advance, removing ambiguity during an active event.
Plan currency
Plans are reviewed and updated as infrastructure changes, and after every test, so the documented plan matches the environment it describes.
FAQCommon questions
Questions Burlington organizations ask
What is the difference between recovery time objective and recovery point objective?
Recovery time objective is how long a system can be down before the impact becomes unacceptable. Recovery point objective is how much data loss, measured in time, is tolerable. They are set independently per system and drive different design decisions — RTO drives infrastructure and automation investment, RPO drives backup frequency.
Do we need a secondary site?
Not necessarily. Cloud-based failover infrastructure meets most Burlington organizations' recovery time objectives without the cost of a dedicated physical site. A secondary site is warranted where regulatory requirement, latency sensitivity, or recovery time objective genuinely demands it.
How is a disaster recovery plan different from a backup?
Backup provides the data. Disaster recovery provides the sequence, infrastructure and documented steps to bring dependent systems back into operation using that data, in the order the business needs them, within a defined time.
How often should the plan be tested?
At minimum annually, and after any material change to infrastructure. Testing is where documented assumptions meet reality, and gaps found in a test cost nothing compared with the same gap found during an actual event.
NEXTRelated capabilities
A plan only proves itself under test
Recovery testing validates recovery time and recovery point objectives against what the infrastructure can actually deliver.
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