Chapter 4 of 5 · AWS SAP-C03
Resilience, Migration, and Business Continuity
SAP-C03 resilience chapter overview: migration waves, rehost and modernize, DR strategies, multi-Region failover, locked backups and resilience tests.
- 6topics
- 31 minfast track
- 1diagrams and exhibits
- 15%of the exam
Topics in this chapter
Take them in order, or jump to the one you need.
- 1Migration Assessment, Rehosting, and Data MigrationPlan AWS migrations at scale: discovery, dependency mapping, migration waves, rehosting with AWS Transform MGN, and data moves…5 min
- 2Replatforming, Refactoring, and Legacy ModernizationChoose replatform or refactor on AWS: managed RDS, Aurora, ECS and Lambda, the strangler fig pattern, and AWS Transform for…5 min
- 3Disaster Recovery Strategies and Continuous ReplicationMatch AWS disaster recovery to RTO, RPO and cost: backup and restore, pilot light, warm standby, active active, and Elastic…5 min
- 4Multi-Region Failover and Resilient ArchitecturesBuild self-healing AWS designs and multi-Region failover with Route 53 health checks, Global Accelerator, ARC, and multi-cluster…Diagram6 min
- 5Backup Governance and Ransomware ProtectionRun AWS Backup across accounts with backup policies and cross account copies, and stop ransomware with Vault Lock, S3 Object Lock…5 min
- 6Resilience Assessment, Testing, and Chaos EngineeringAssess and prove AWS resilience: Resilience Hub policies and scores, Systems Manager runbooks, failover tests, and AWS Fault…5 min
About this chapter
What this chapter covers
This chapter is 15% of the AWS Certified Solutions Architect Professional SAP-C03 exam. It covers two linked jobs: moving and modernizing workloads at scale, and keeping them recoverable once they run on AWS.
The migration half runs from discovery and wave planning through rehosting, data migration, replatforming, refactoring and mainframe modernization. The continuity half covers DR strategies against RTO and RPO, continuous replication, multi-Region failover, backup governance, ransomware protection and proving recovery with tests.
Questions are long multi-account scenarios. Most are single answer, and multiple-response questions state the count, such as "Which TWO".
Discriminators like MOST cost-effective, LEAST operational overhead or lowest RTO decide between options that all work. There are no exhibits.
How the topics fit together
Migration moves the workload in, modernization reduces its operating burden, and continuity design plus testing keeps it running.
- Migration starts with dependency data, then moves servers and data with minimal downtime.
- Modernization picks the lowest level of change that meets the goal: replatform before refactor.
- Disaster recovery picks the cheapest strategy that meets both RTO and RPO.
- Data protection keeps immutable copies in a separate account so ransomware cannot erase them.
- Testing turns estimated recovery times into measured ones.
In every DR question, write down the stated RTO, RPO and budget first. The correct answer meets both targets at the lowest cost, not the best possible recovery at any price.
How to use these pages
Each topic page has the same shape, so you can skim for what you need.
- What it is: the idea in plain words.
- How it works: the mechanism, with diagrams and examples.
- What to remember for the exam: the facts to memorize.
- Common mistakes: the classic traps.
- Check yourself: three questions to test your understanding.
Focus on the trigger words in each scenario, such as minimal downtime, RPO of seconds, immutable, operator approved and LEAST operational overhead. They point straight to the answer.
Ready for more practice?
The full AWS SAP-C03 question bank has 850 questions, with timed practice exams and an explanation for every answer.
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