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AWS Certified Solutions Architect - Professional · AWS
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Uses AWS Backup to copy backups cross-region. Restore databases during disaster. Traffic switch using Amazon Route 53 failover. ✔ Meets RPO hours (scheduled backups). ✔ Restore within RTO 4 hours. ✔ Lowest cost because infrastructure runs only in primary region.
Cost Effetive..
B is the correct answer, this solution is a classic Pilot Light solution for DR. First, we have to identify the possible failure point of this system and obviously, they are Aurora and DynamoDB. - For Aurora, instead of using expensive global db option, we can use Aurora Serverless option in secondary region and let it auto pause when no traffic is received. We then use DMS job to periodically sync data between primary region and secondary region. - For DynamoDB, we can also create a regional setup and trigger UpdateItem API to sync data. When the primary region goes out, the secondary region lit up and Route 53 point traffic to healthy region.