Choose a disaster recovery service by first setting a recovery time objective (RTO) and recovery point objective (RPO) for each critical workload. Then compare the service’s recovery design, backup protections, tested results, operating responsibilities, and full cost against those targets. A provider’s advertised capability is not proof that your applications will recover on time: the configured environment and runbooks need to be exercised.
Start with the recovery each workload needs
RTO and RPO describe different limits. RTO is the maximum acceptable time between a disruption and restoring an application. RPO is the maximum acceptable gap between the data available after recovery and the latest application data before disruption. Set them separately for each workload; one portfolio-wide target can conceal very different business needs.
Inventory applications and the dependencies required to make them usable, including data stores, identity, networking, DNS, and third-party services. For each workload, decide how much downtime and data loss the business can tolerate, what manual workaround is acceptable, and what users or business owners must verify before service is declared restored. Microsoft’s Azure Well-Architected guidance says, “Criticality is a business decision and it’s your responsibility to help guide that decision.” Microsoft Azure Well-Architected Framework guidance discusses that responsibility.
Use those impact decisions to set priorities and a recovery order. Ask a provider what its stated RTO and RPO actually measure, which dependencies are included, and what actions, capacity, or assumptions are your responsibility. A target that excludes identity, application validation, or traffic redirection may not describe the time until users can work.
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Compare recovery architectures against those targets
Disaster recovery approaches differ in how much infrastructure is ready before an incident. AWS publishes the following illustrative profiles; they are architecture examples, not independent benchmarks or guarantees for a customer workload.
| Approach | Published illustrative profile | What is ready before recovery | Selection consideration |
|---|---|---|---|
| Backup and restore | RPO in hours and RTO in 24 hours or less in AWS guidance dated July 2, 2020. Automated or continuous backups can reduce RPO in some cases. | Backups are available; infrastructure and data generally need to be rebuilt or restored. | Consider only if the business can accept the recovery time and the organization can restore data and rebuild required services. |
| Pilot light | RPO in minutes and RTO in tens of minutes in AWS guidance dated March 31, 2022; other AWS guidance describes RTO in hours. | Core infrastructure and data are prepared, but additional resources must be started or deployed during recovery. | Confirm the specific design and recovery steps: the pattern name does not guarantee a particular result. |
| Warm standby | RPO in seconds and RTO in minutes in AWS guidance dated March 31, 2022. | A scaled-down functional environment is already running and can be scaled up. | Compare the steady-state cost with the capacity that is actually ready to serve traffic. |
| Multi-region active-active | Near-zero RPO and potentially zero RTO in AWS guidance dated March 31, 2022. | Workloads operate across multiple regions, requiring synchronization and conflict handling. | Use only when the business need justifies the added cost, consistency design, and operational complexity; check data-residency constraints. |
These profiles come from AWS Well-Architected recovery-strategy guidance and AWS disaster recovery guidance. Actual results depend on architecture, data change rates, dependencies, network capacity, automation, regional and control-plane availability, procedures, and test execution. AWS notes that strategies generally increase in cost and complexity as RTO and RPO decrease; Microsoft likewise advises aligning investment with workload criticality.
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Check the recovery design and its failure boundaries
Ask the provider to map the proposed design to the disruptions your organization must withstand. Microsoft identifies regional loss, provider control-plane unavailability, corrupted production systems, severe multi-tier failures, and natural or geopolitical disruptions as possible disaster conditions. Which ones matter depends on your systems and obligations.
- Confirm where recovery systems and data reside, how geographically separate they are, and whether they share infrastructure or dependencies with production.
- Check network routes, identity services, DNS, capacity quotas, and the availability of resources needed to recover. A separate region does not help if an essential shared dependency remains unavailable.
- Verify that data location and recovery locations meet jurisdiction and residency requirements. AWS notes that a multi-region approach may not suit workloads with residency constraints.
- Request documented failover and failback steps, including who redirects traffic, how the recovered state is validated, and how service returns to the primary environment.
Ask what happens if the recovery environment itself is unavailable or a provider control plane cannot be used. The answer should identify alternatives and operational dependencies, rather than treating geographic separation as sufficient by itself.
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Evaluate backup and cyber-recovery protections separately
Replication can help recover from some site failures, but it can also reproduce corruption, deletion, or other destructive changes. It is not a substitute for independent point-in-time backups. AWS specifically warns that replication alone does not protect against corruption or destruction without point-in-time recovery options.
- Determine whether backups are separated from production credentials and failure domains, encrypted, retained for appropriate periods, and protected from unauthorized deletion.
- Confirm how point-in-time recovery works and whether replicated data is backed up separately.
- Require evidence that backups complete, remain available and intact, and can be restored. CISA recommends offline encrypted backups of critical data and regular testing of their availability and integrity in its ransomware guidance.
- For an offline drive used as one backup component, account for capacity, encryption-key management, access controls, lifecycle, and a tested restore procedure. A device alone is not an enterprise recovery design.
Demand test evidence and operational readiness
A vendor’s claimed capability is not the same as a tested outcome for your configured workloads. Ask how recovery exercises work and what evidence you will receive. AWS recommends following the recovery plan in drills and checking that the recovery site meets required objectives.
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- Establish the test scope and frequency, customer participation, production-isolation safeguards, success criteria, and reporting.
- Use the actual runbooks and measure elapsed recovery time, the data and application state recovered, data loss against the RPO, and business-level functionality—not just whether infrastructure starts.
- Name the people or roles authorized to declare a disaster, execute recovery, communicate status, and escalate. Set triggers for missed milestones or unresponsive support.
- Track findings to closure and repeat affected recovery steps after material changes. Microsoft recommends validating data after tests and updating architecture and runbooks when gaps are found.
Before selecting a service, make sure the organization can carry out its side of the plan: maintain configuration and procedures, reach decision-makers, provide required access, and approve recovery actions on time. The provider should be explicit about which tasks belong to its team and which remain yours.
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Read the agreement alongside the technical design. Map contractual commitments to your own RTO and RPO, and ask which exclusions or customer prerequisites could prevent the service from meeting them. Clarify how incidents are communicated, who can access recovery data, how activity is logged, where data is stored, and what subcontractors are involved. Review whether production and recovery environments have appropriately separated access.
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Set out responsibility for maintaining configurations and runbooks, paying for standing capacity and test environments, and covering usage during an actual recovery. Include the cost and staff effort for replication, storage, data transfer, retained backups, exercises, standby capacity, and recovery support. A headline service price does not show the full cost of a workable recovery capability.
For AWS Disaster Recovery Service specifically, AWS points customers to its service-level agreement for terms and recommends Business or Enterprise Support for production workloads. Treat that as AWS-specific guidance, not a general requirement for every provider; evaluate the support model and remedies in the agreement you are considering.
Use a shortlist gate before signing
Keep a provider in consideration only if you can answer these questions with evidence:
- Are workload-specific RTO and RPO targets tied to business impact and recovery order?
- Does the proposed architecture address the relevant failure scenarios, dependencies, data location, and failback?
- Are point-in-time backups protected independently from replicated production data, with restore tests?
- Can the service demonstrate recovery using your runbooks, with results measured against the required objectives?
- Are disaster authority, provider and customer duties, escalation, contract exclusions, support, and full operating costs clear?
If a provider cannot explain an assumption or show how a recovery step is tested, treat that as an unresolved design risk—not as evidence that the service will meet your target.
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