Warning 2013/08/16 18:49:38 875 Data Plugin NETVAULT TaskID Failed to enable CBT for VM
Warning 2013/08/16 23:22:11 875 Data Plugin NETVAULT Job completed with warnings/errors
reason for this was because the machine version was below version 7 and CBT is not supported on machines versions less than version 7. This is not a netvault issue this is a VMware limitation. To verify the version of your VM you can right click and edit the VM from the virtual server and the version should be seen in top right hand corner of the edit properties window.
The VM will be backed up but in full image mode.
Upgrade the version of the virtual machine to 7 or above or run image backups