Starting today, with Amazon EBS Local Snapshots on Outposts you can store snapshots of your Amazon EBS volumes locally on Amazon S3 on Outposts to meet your data residency and local data processing needs. EBS Local Snapshots on Outposts require your Outpost to be provisioned with S3 on Outposts. You can also continue to back up your EBS volumes to snapshots stored on S3 in the AWS Region. Snapshots are point-in-time copies of your data which can be used to enable disaster recovery and improve backup compliance.
Source:: Amazon AWS