Which solution will meet these requirements?
Amazon FSx for Windows File Server with a Multi-AZ deployment
Amazon FSx for NetApp ONTAP with a Multi-AZ deployment
Amazon Elastic File System (Amazon EFS) with the Standard storage class
Amazon FSx for OpenZFS
Explanations:
Amazon FSx for Windows File Server provides high durability and Multi-AZ deployment, but it does not natively support replication to another Region with AWS Backup. The RPO of 8 hours cannot be directly achieved using this service.
Amazon FSx for NetApp ONTAP offers Multi-AZ deployment and can support replication, but it is not integrated with AWS Backup to meet the specified RPO requirement for cross-region replication.
Amazon Elastic File System (EFS) with the Standard storage class offers durability, Multi-AZ deployment, and integration with AWS Backup to replicate data across Regions. EFS supports cross-region replication with AWS Backup, meeting the RPO requirement.
Amazon FSx for OpenZFS does not support Multi-AZ deployments in the same way as the other FSx services and does not offer cross-region replication with AWS Backup, making it unsuitable for this use case.