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Answer: Use AWS Elastic Disaster Recovery configured to replicate disk changes to AWS as a pilot light.
## Explanation **Why Option C is correct:** AWS Elastic Disaster Recovery (formerly CloudEndure Disaster Recovery) is specifically designed for disaster recovery scenarios with tight RPO and RTO requirements. Here's why it meets all the requirements: 1. **RPO of 30 seconds or fewer**: AWS Elastic Disaster Recovery continuously replicates block-level changes from the source VM to AWS, achieving near-continuous data replication with minimal RPO. 2. **RTO of 60 minutes**: The solution can quickly spin up replicated instances in AWS, meeting the 60-minute RTO requirement. 3. **Cost minimization**: The "pilot light" configuration keeps minimal resources running in AWS (just enough to maintain the replicated data), significantly reducing costs compared to maintaining a fully operational standby environment. 4. **Microsoft SQL Server Standard compatibility**: AWS Elastic Disaster Recovery replicates the entire VM, including the SQL Server installation, without requiring an upgrade to Enterprise edition. **Why other options are incorrect:** **Option A**: Requires upgrading to SQL Server Enterprise edition, which increases costs. Multi-site active/active is also more expensive than needed for DR purposes. **Option B**: While AWS DMS with CDC can achieve low RPO, it requires maintaining a warm standby RDS instance, which is more expensive than a pilot light configuration. Also, RDS licensing costs may be higher. **Option D**: Nightly backups cannot meet the 30-second RPO requirement. This approach would result in significant data loss (up to 24 hours) in a disaster scenario. **Key AWS services mentioned:** - **AWS Elastic Disaster Recovery**: Continuous replication service for disaster recovery - **Pilot light configuration**: Minimal standby resources to reduce costs - **RPO (Recovery Point Objective)**: Maximum acceptable data loss - **RTO (Recovery Time Objective)**: Maximum acceptable downtime
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A company wants to use the AWS Cloud to improve its on-premises disaster recovery (DR) configuration. The company's core production business application uses Microsoft SQL Server Standard, which runs on a virtual machine (VM). The application has a recovery point objective (RPO) of 30 seconds or fewer and a recovery time objective (RTO) of 60 minutes. The DR solution needs to minimize costs wherever possible.
Which solution will meet these requirements?
A
Configure a multi-site active/active setup between the on-premises server and AWS by using Microsoft SQL Server Enterprise with Always On availability groups.
B
Configure a warm standby Amazon RDS for SQL Server database on AWS. Configure AWS Database Migration Service (AWS DMS) to use change data capture (CDC).
C
Use AWS Elastic Disaster Recovery configured to replicate disk changes to AWS as a pilot light.
D
Use third-party backup software to capture backups every night. Store a secondary set of backups in Amazon S3.