Answer: Use AWS DataSync.

## Explanation **AWS DataSync** is the correct answer because it provides the LEAST operational overhead for transferring large amounts of data between NFS file systems in different AWS Regions on a periodic basis. ### Why AWS DataSync is the best choice: 1. **Purpose-built for file system transfers**: DataSync is specifically designed for moving data between on-premises storage, AWS storage services, and between AWS Regions. 2. **NFS support**: DataSync natively supports NFS file systems, making it ideal for this scenario. 3. **Automated and managed service**: DataSync is a fully managed service that automates data transfer, handles network optimization, and provides built-in validation and monitoring. 4. **Periodic transfers**: DataSync supports scheduled transfers, which aligns perfectly with the requirement for periodic data movement. 5. **Least operational overhead**: As a managed service, DataSync requires minimal setup and maintenance compared to other options. ### Analysis of other options: **B. AWS Snowball devices**: - Physical devices that need to be shipped - High operational overhead for ordering, shipping, and managing devices - Not suitable for periodic transfers between AWS Regions - Better for one-time large data migrations from on-premises to AWS **C. Set up an SFTP server on Amazon EC2**: - Requires manual setup, configuration, and maintenance - High operational overhead for managing EC2 instances, security, and networking - Not optimized for large-scale data transfers between Regions - Requires scripting and automation for periodic transfers **D. AWS Database Migration Service (AWS DMS)**: - Designed specifically for database migrations, not file systems - Not suitable for NFS file system transfers - Focuses on database replication and migration, not general file transfers ### Key benefits of AWS DataSync for this scenario: - **Automated scheduling**: Can be configured for periodic transfers - **Incremental transfers**: Only transfers changed data after the initial sync - **Data validation**: Automatically validates data integrity - **Network optimization**: Uses parallel streams and compression for efficient transfers - **Monitoring and logging**: Integrated with CloudWatch for monitoring - **Security**: Uses TLS encryption for data in transit Therefore, AWS DataSync provides the most efficient, automated, and low-overhead solution for periodic NFS file system transfers between AWS Regions.

Author: LeetQuiz Editorial Team