How can the developer accomplish this task with the LEAST amount of configuration?
Encrypt the files by using server-side encryption with S3 managed encryption keys (SSE-S3). Enable S3 bucket replication.
Encrypt the files by using server-side encryption (SSE) with an AWS Key Management Service (AWS KMS) customer master key (CMK). Enable S3 bucket replication.
Use the s3 sync command to sync the files to the S3 bucket in the other Region.
Configure an S3 Lifecycle configuration to automatically transfer files to the S3 bucket in the other Region.
Explanations:
Encrypting files using SSE-S3 provides encryption at rest using Amazon S3 managed keys. Enabling S3 bucket replication allows automatic copying of these files to another bucket in a different region with minimal configuration.
While using AWS KMS provides more control over encryption keys, it requires additional configuration compared to SSE-S3. Although replication is supported, the added complexity of managing KMS keys makes this option less favorable for minimal configuration.
Thes3 synccommand is a manual process that requires ongoing management and does not provide automatic replication. This option is not suitable for disaster recovery as it does not ensure real-time synchronization.
S3 Lifecycle configurations are used for transitioning or expiring objects over time, not for automatic replication to another bucket in a different region. This option does not meet the requirement for disaster recovery.
My best guess is:
Encrypt the files by using server-side encryption with S3 managed encryption keys (SSE-S3). Enable S3 bucket replication.