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Hi, AWS EFS is a possible alternative to EBS for you. It offers cross-region replication. See https://docs.aws.amazon.com/efs/latest/ug/efs-replication.html
You can use Amazon EFS replication to create a replica of your Amazon EFS file system
in the AWS Region of your preference. When you enable replication on an EFS file system,
Amazon EFS automatically and transparently replicates the data and metadata on the
source file system to a new destination EFS file system.
...
Amazon EFS automatically keeps the source and destination file systems synchronized.
Amazon EFS replication is continual and designed to provide a recovery point objective (RPO)
and a recovery time objective (RTO) of minutes. These features should assist you in meeting
your compliance and business continuity goals.
i have ebs volume on ap south 1a , at the same time can it be stored on ap south 1b as well?
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If multi-AZ block storage is required, then iSCSI volumes presented from a multi-AZ deployment of Amazon FSx for NetApp ONTAP is a good solution.
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EBS is not a mult-AZ service and it exists only in the same AZ as of your instance. If you take snapshots from the EBS volume, they will be stored on S3 that is replicated to three AZ.