ISSUE:
VM Backups failing with "The VM is configured with one or more unrecognized virtual hardware devices (VirtualTPM) and cannot be backed up with this configuration" error.
CAUSE:
Encrypted VMs are not supported for Host-level backup. The VM encryption feature and features that require VM encryption (such as virtual TPM) are not supported.
RESOLUTION:
Install Unitrends Agent on VM and perform Agent level backups (File-level or Image-level)