Storage
The AWS Outposts service provides three storage types:
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Instance storage on supported EC2 instance types
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Amazon Elastic Block Store (EBS) gp2 volumes for persistent block storage
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Amazon Simple Storage Service on Outposts (S3 on Outposts)
for local object storage
Instance storage is provided on supported servers (C5d, M5d, R5d, G4dn, and I3en). Just like in the Region the data in an instance store persists only for the (running) lifetime of the instance.
Outposts EBS volumes and S3 on Outposts object storage are provided as part of the AWS Outposts managed service. Customers are responsible for capacity management of the Outpost storage pools. Customers specify their storage requirements for EBS and S3 storage when ordering an Outpost. AWS configures the Outpost with the number of storage servers required to provide the requested storage capacity. AWS is responsible for the availability of the EBS and S3 on Outposts storage services. Sufficient storage servers are provisioned to provide highly available storage services to the Outpost. Loss of a single storage server should not disrupt the services nor result in data loss.
You can use the AWS Management Console and CloudWatch metrics to monitor Outpost EBS and S3 on Outposts capacity utilization.
Data protection
For EBS Volumes: AWS Outposts support EBS volume snapshots to provide a simple and secure data protection mechanism to protect your block storage data. Snapshots are point-in-time incremental backups of your EBS volumes. By default, snapshots of Amazon EBS volumes on your Outpost are stored on Amazon S3 in the Region. If your Outposts have been configured with S3 on Outposts capacity, you can use EBS Local Snapshots on Outposts to store snapshots locally on your Outpost using S3 on Outposts storage.
For S3 on Outposts buckets: You can use AWS DataSync
Instance replication: You can use CloudEndure

Disaster recovery (DR) from an Outpost to the Region
Using AWS Outposts as a CloudEndure destination (replication target) requires S3 on Outposts storage.
Recommended practices for data protection:
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Use EBS snapshots to create point-in-time backups of block storage volumes to Amazon S3 in the Region or S3 on Outposts.
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Use AWS DataSync to backup objects stored in S3 on Outpost to Amazon S3 in the Region.
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Use CloudEndure to replicate instances between on-premises systems, logical Outposts, and the Region.