Amazon S3 storage
Amazon S3 is an object storage service built to store and retrieve any amount of data from anywhere. It supports any type of cloud storage that uses the Amazon S3 interface.
The site connects to the endpoint you select for a specific service. This service endpoint can be Amazon S3, Alibaba Cloud Object Storage, Dell ECS, or [Custom Service].
In Backup Administration for Microsoft 365, the service endpoints for Amazon Simple Storage Service and Alibaba Cloud Object Storage are preconfigured. If you want to use a different cloud service that supports the Amazon S3 interface, you can select Dell ECS or [Custom Service] for the service and then enter a custom URL for that service endpoint.
The version specifies which communication version to use for the service endpoint (the service version is specified by the endpoint service). All services support Service Version 2 or 4.
The access key and secret access key are used to authenticate the caller with the cloud service. These keys are provided by the cloud storage service.
This storage type also supports compression and single instancing, which can save you a lot of space.