Abstract

A fundamental component of cloud architecture, disaster recovery (DR) guarantees business continuity in the event of failures. Based on Recovery Time Objective (RTO), Recovery Point Objective (RPO), cost, and complexity, this review looks at AWS disaster recovery techniques—from Backup and Restore to Multi-Site Active/Active. While Pilot Light and Warm Standby balance cost and recovery speed by retaining either minimum or reduced infrastructure, Backup and Restore offers a sluggish but reasonably priced recovery choice. Multi-Site Active/Active guarantees almost instantaneous failover but requires large operational overhead and financial outlay. Implementation of DR solutions depends much on AWS products such AWS Elastic Disaster Recovery, Amazon S3, AWS Cloud Formation, and Amazon Route 53. Key best practices to maximize DR impact are automation, testing, and monitoring. Smooth failover and restoration depend on addressing issues such data synchronization, network configuration, and application dependencies. Comparative study shows that an organization's tolerance for downtime, financial restrictions, and compliance needs determines its ideal DR strategy. While those wanting faster recovery can choose Pilot Light or Warm Standby, cost-sensitive companies can depend on Backup and Restore. Despite their great expense and complexity, Multi-Site Active/Active helps mission-critical systems needing highest availability. Resilience and efficiency will be improved by future trends in AWS DR including increased multi-region replication, serverless failover, and AI-driven automation. Organizations may reduce risk, guarantee data integrity, and accomplish flawless recovery in disaster situations by implementing a clearly defined, scalable, tested DR strategy.