Storage Accelerator provides a method for client machines to directly write data to the cloud storage without sending the data to another MediaAgent.
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When using Storage Accelerators in MSP environments, it is recommended to create a separate storage pool and plan with a dedicated bucket and storage account for each tenant. This will ensure that data associated with each tenant is segregated and as a result each tenant will have exclusive access to their respective data. For more information about creating cloud storage pools, see Configuring a Cloud Storage Pool. For more information about creating a plan, see Adding Plans for Your Service Catalog (Fully Managed Deployments). 
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Additionally, you can create a secondary cloud storage credential for the Storage Accelerator in the mount path. For more information about adding a secondary credential, see Adding a Secondary Cloud Storage Credential for Storage Accelerator