Free ESXi is not supported. Veeam Backup & Replication leverages vSphere and vStorage APIs that VMware disables in free ESXi.
Install a VMware license that provides vSphere and vStorage APIs.
If Free ESXi is intentionally being used, consider using Veeam Backup & Replication to back up the Guest OS of the Virtual Machines by treating them as if they are physical machines by using Veeam Agent-based backup. For more information, review: Veeam Agent Management Guide.
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