A successful backup job or a server that boots in a recovery Region does not by itself prove that an application can recover. A useful disaster recovery (DR) test follows a chosen recovery point through infrastructure startup, dependency checks, application validation, and the steps operators would take to restore service.

This guide shows how to combine AWS Elastic Disaster Recovery (AWS DRS) recovery drills, AWS Backup restore testing, and application-level checks. It also explains where AWS Fault Injection Service (AWS FIS) fits: FIS tests how a workload responds to injected faults, while DRS drills and backup restore tests exercise recovery from replicated data or backups.

Choose the test that answers your recovery question

Start with the failure you need to prepare for. A server recovery, a backup restore, and a fault-injection experiment test different parts of the recovery plan.

Test What it tests What still needs validation
AWS DRS recovery drill Launches drill instances for protected source servers from a selected recovery point, using the recovery launch process. Application behavior, dependencies, traffic routing, and whether measured recovery time and data point meet your workload objectives.
AWS Backup restore test Runs a scheduled restore job from an eligible backup for a selected protected resource. Application-level checks and any related resources that are outside the selected restore test.
AWS FIS experiment Applies controlled actions to real AWS resources to test workload behavior under faults. Whether your backup or recovery procedure can restore data and service from a recovery point.

Use AWS DRS drills to test server recovery

AWS DRS continuously replicates supported source servers to a staging area and can launch EC2 drill instances from a selected point in time. Its server replication is block-level and crash-consistent, so a successful launch alone does not prove that application data is consistent; include the recovery checks required by stateful applications. AWS describes a recovery drill as a non-disruptive test: it follows the recovery launch process without changing the source server or interrupting ongoing replication. A drill creates real EC2 resources in the target account, which incur charges until they are deleted. See AWS's recovery drill guide and DRS recovery concepts for details.

Review the recovery subnet, security groups, instance profile, launch settings, and post-launch actions before running the drill. DRS uses the same launch settings and point-in-time snapshots for drills and recovery, so isolate drill instances from production systems. Prevent duplicate hosts from registering with production services, sending real notifications or payments, or receiving live traffic. Check AWS's DRS launch settings documentation for the settings that affect drill and recovery instances.

DRS recovers server workloads to EC2; it is not a general failover orchestrator for every AWS-managed database or application service. DRS can orchestrate groups of protected source servers with a recovery plan, but redirecting production traffic remains a separate step managed through a DNS or traffic-management service. AWS explains the boundary between recovery, failover, and failback in its recovery and failback guide.

Use AWS Backup restore testing to test backups

AWS Backup restore testing schedules test restores for selected protected resources and eligible recovery points. You choose the schedule, resource selection, recovery-point selection, and how long restored test data is retained before cleanup. To check application behavior, add a programmatic validation workflow: AWS documents using an EventBridge rule to invoke Lambda or another supported target after a restore job completes, then recording the result with the AWS Backup restore validation API. See the AWS Backup restore testing guide and its restore validation guide.

Restore testing is not available for every resource type in every Region. Confirm that your resource and Region are supported in the current AWS Backup feature availability matrix before building a test around it.

Use AWS FIS for a separate resilience test

AWS FIS runs experiments that apply specified actions to selected AWS resources. It can help test whether a workload detects and handles a fault, but an FIS experiment does not replace restoring from a backup or launching a DRS recovery drill. FIS acts on real resources, so plan experiments carefully, start with a controlled scope, and configure CloudWatch alarm stop conditions for unacceptable impact. AWS recommends planning experiments and testing in pre-production before using FIS in production. See the AWS FIS overview and stop-condition guidance.

If you are still choosing a regional recovery pattern, our guide to Pilot Light and Warm Standby provides a broader comparison. Test the selected design against the objectives and dependencies of your own workload.

Build a repeatable DR test

1. Define the workload and recovery objectives

List the application components in scope, their dependencies, the recovery location, and the data sources needed to restore them. Set a Recovery Time Objective (RTO), the maximum acceptable time from service interruption to service restoration, and a Recovery Point Objective (RPO), the maximum acceptable age of the recovery point at the time of interruption. AWS recommends setting these objectives for each workload based on business needs; see its DR planning guidance.

Define a pass condition that represents useful service, not just a successful AWS job. For example, identify a health endpoint or a safe, synthetic transaction that confirms the application can reach its dependencies and return expected data. Keep the check isolated from production writes.

2. Prepare the recovery environment and runbook

For a DRS drill, verify that replication has completed initial sync, choose the recovery point, and review the launch template, network access, instance roles, secrets, licenses, and post-launch actions. Run the drill in a network path that cannot take over production traffic or affect live systems. Include dependent servers in the test when the workload needs them to start in a particular order.

For AWS Backup, create a restore testing plan that selects the resource types and recovery points you need to exercise. Configure a retention window long enough for validation if the default cleanup would remove restored resources too soon. Record any prerequisites that the restore job does not recreate, such as application configuration or external dependencies.

3. Validate the recovered service and measure the result

Run the same checks on every drill so results can be compared over time. A useful sequence is:

  1. Confirm the DRS recovery job or AWS Backup restore job completed, then check the status and access path of the resulting resources.
  2. Verify that required servers, databases, network routes, credentials, and other dependencies are available in the test environment.
  3. Run a safe application health check or synthetic transaction, then check that the restored data is usable and consistent for the test.
  4. Record the simulated interruption time, the recovery-point timestamp, and the time when the defined service check passes. Compare the time between interruption and recovery-point timestamps with the RPO, and elapsed time from interruption to accepted service with the RTO. If the exercise omits detection, decision, or other recovery steps included in the RTO, report the measured recovery segment separately.

A green infrastructure status is evidence that resources launched; it does not prove a user-facing workflow is working. AWS DRS supports post-launch verification actions during drills, and AWS Backup supports custom validation workflows for completed restore test jobs. Keep application-specific checks in your runbook because the right acceptance test depends on the workload.

Automate repeatable recovery steps

Automate the sequence you have already tested manually. AWS DRS recovery plans can execute a drill or recovery for groups of source servers in a defined order with waits between groups. For AWS Backup, a scheduled restore testing plan can select resources and recovery points; an EventBridge rule can then start validation when a restore job completes. These mechanisms automate service operations, but your test still needs an explicit application pass condition and a process for reviewing failures.

Use CloudFormation templates to provision repeatable network and support resources for a test, then verify the deployed configuration and data path against the workload you need to recover. Templates describe infrastructure; they do not replace replication, backup, or application validation. For a custom flow spanning multiple services, Step Functions can coordinate AWS API or Lambda tasks, waits, and retry or error-handling paths. Add cleanup and failure handling to the workflow. See the AWS guides for CloudFormation templates, Step Functions service integrations, and Step Functions error handling.

Keep recovery routing as an explicit runbook step. If a real incident requires changing traffic, AWS DRS does not make that decision or perform the traffic switch for you. Assign an owner, define the conditions for routing traffic, and test those actions safely in the recovery environment.

Clean up test resources and review costs

Terminate DRS drill instances and remove related test resources when validation is complete. AWS DRS instances are billed until deleted. AWS Backup restore tests normally clean up restored data after the test; if you extend retention for validation, verify that cleanup succeeded and remove any resource left behind. AWS Backup restore testing can incur evaluation, restored-storage, and resource-retention charges, so check the current AWS Backup pricing for the resource types and Regions in your plan.

Turn each test into a recovery improvement

Repeat tests on a risk-based schedule and after meaningful changes to the workload, recovery configuration, or dependencies. AWS recommends performing DRS recovery drills at least quarterly; compliance or business requirements may call for a more frequent cadence. Record the test scope, selected recovery point, job results, application checks, observed recovery time and data gap compared with RTO/RPO, cleanup status, and any follow-up owner. Use failed checks to update the recovery plan, then rerun the affected test.

The goal is evidence that the workload can recover to an acceptable state from the selected recovery point. DRS drills, AWS Backup restore tests, and FIS experiments can automate important parts of that proof, but application-level validation ties those parts back to the service your users need.

FAQs

Does a successful DRS drill prove the application is recovered?

No. It confirms that DRS launched the drill instance successfully. Check the operating system, dependencies, application health, and a representative user workflow, then compare the observed recovery time and point in time with the workload's objectives.

Does AWS DRS perform failover and switch traffic?

DRS launches recovery instances and supports failback, but failover means redirecting production traffic to those instances. That traffic change is handled outside DRS, for example through Route 53 or another traffic-management system, and should be covered by the recovery runbook.

Can AWS Backup restore testing check application health?

AWS Backup runs the restore test. You can add a programmatic validation workflow, such as a Lambda function invoked by EventBridge, to run application-specific checks after a restore job completes and record the result.

Does AWS FIS replace a DR test?

No. FIS tests how a workload responds to selected faults. A DRS drill or AWS Backup restore test checks recovery from replicated server data or a backup. These tests can complement each other, but each needs its own success criteria.