You can use the Commvault Windows File System agent to back up and restore the AWS FSx SMB shares that are configured with the AWS managed active directory.
Key Features
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You can perform full, differential, incremental, and synthetic full backups of files hosted on AWS FSx SMB shares. 
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You can back up and restore AWS FSx SMB shares data with ACLs. 
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You can back up Amazon FSx file storage that is mounted on Linux by using a Linux proxy. The content to be backed up by the subclient must be on a mounted path that has been mounted on an access node using the CIFS protocol. You cannot use the automount format. 
Limitations
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When you restore AWS FSx SMB shares data to on-premise computers, ACL restores might only display the user ID because the on-premise domain might not map the AWS FSx SMB share domain. 
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When you restore data from an on-premise computer to AWS FSx SMB shares, the data is restored. However hard links, soft links, and some special attributes such as compression are lost. 
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You cannot restore both data and ACLs from an on-premise computer to AWS FSx. 
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When you back up Amazon FSx file storage that is mounted on Linux, ACLs which have been created on the SMB share are not backed up.