A snapshot could not be created. Either the backup sources contain both NTFS and CSV files or a Hyper-V virtual machine has files on a Cluster Shared Volume (CSV) and files that are not on a CSV.
V-79-40960-38508 - A000966C
One of two scenarios could have caused this error. The backup sources may contain both NTFS and CSV files. Or you are trying to back up a Hyper-V virtual machine that has some files that reside on a CSV and some files that do not reside on a CSV.
You must process NTFS and CSV volumes one at a time in order for the backup to be successful. If the backup sources contain both NTFS and CSV files, select the “Process logical volumes for backup one at a time” option in the Advanced File options. Then retry the job.
For Hyper V VM and physical machine:
For VMware VM:
The above solution was not working for Cluster which has VMware VM. In order to backup a VMware VM node the disk format must be either CSV or NTFS.