AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A financial services firm has applications that are crucial for daily operations. The firm cannot tolerate more than 2 hours of downtime and must ensure no more than 5 minutes of data loss in the event of a regional failure. The current deployment spans several Availability Zones within a single AWS Region. Which disaster-recovery approach meets these business continuity requirements while avoiding unnecessary cost and complexity?
Arranging a scaled-down, always-running version of the application stack in another Region that can be quickly scaled up during an outage.
Formulating an active-active topology distributed over multiple Regions with both sites simultaneously serving production traffic.
Performing regular backups to cross-Region storage and restoring the environment in a different Region when a disaster occurs.
Adopting a strategy where only the core components are kept running in another Region and the rest of the stack is started when needed.
Warm standby keeps a scaled-down but fully functional copy of the workload running in a separate Region. Data is continuously replicated (RPO in seconds), and the standby can be rapidly scaled to full size (RTO in minutes), satisfying the firm's ≤2 hour RTO and ≤5 minute RPO objectives without the higher cost of an active-active topology. Pilot-light and backup-and-restore strategies have longer RTOs, while active-active exceeds the requirements and incurs greater expense.
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