Hardware Encryption allows you to encrypt data on tape drives that have built-in encryption capabilities. Hardware encryption provides considerably faster performance than software encryption.
Several tape drives like LTO4 or higher support encryption of data on the tape drive. These tape drives provide the necessary controls to the backup applications to get the encryption capabilities as well as set the encryption properties on the drive. Some of tape libraries also provide key management services. Commvault's Hardware Encryption feature provides key management for the tape libraries that do not support key management by themselves.
The software performs the key management for hardware encryption using Hardware or Library Management of Encryption Keys.
Refer to the storage vendor documentation for guidance on usage and configuration of cloud storage side encryption.