Which Commvault component is installed on the hypervisor hosts to perform image-based backups?
The Virtual Server Agent (VSA) is the Commvault component responsible for image-based (agentless) backup and recovery of virtual machines. It is deployed on a proxy server—often the hypervisor host itself or a machine with access to it—to interface with the hypervisor management layer (such as vCenter Server for VMware or a Hyper-V host) and capture full VM images without needing an agent inside each guest OS. This differs from the File System Agent, which performs file-level backups requiring an in-guest agent, and there is no standard Commvault component called 'Backup Gateway Agent' used for this role.
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