Which solution will meet these requirements MOST cost-effectively?
Use the EFS-to-EFS backup solution to replicate the data to an EFS file system in another Region.
Run a nightly script to copy data from the EFS file system to an Amazon S3 bucket. Enable S3 Cross-Region Replication on the S3 bucket.
Create a VPC in another Region. Establish a cross-Region VPC peer. Run a nightly rsync to copy data from the original Region to the new Region.
Use AWS Backup to create a backup plan with a rule that takes a daily backup and replicates it to another Region. Assign the EFS file system resource to the backup plan.
Explanations:
EFS-to-EFS backup solution is an AWS sample solution but is not a fully managed service. It requires setting up and maintaining a Lambda function, which is less cost-effective.
Copying data to S3 and enabling Cross-Region Replication could work, but it introduces additional costs for data transfer and storage in S3, making it less cost-effective.
Using VPC peering and rsync requires ongoing management and incurs data transfer costs. This solution is also less efficient and not a managed service.
AWS Backup provides a managed, cost-effective solution for cross-Region EFS replication through scheduled backups with minimal management overhead.
From my point of view, the answer is:
Use AWS Backup to create a backup plan with a rule that takes a daily backup and replicates it to another Region. Assign the EFS file system resource to the backup plan.