Backup exec 20.1
Hyper-V cluster 2012 r2
Backup always Full metod
V-79-40960-38527 - A change to the selected processing method for Hyper-V incremental backups was detected during the backup of virtual machine 'co-accx64'. This virtual machine was backed up using a full backup because the 'Use the full backup method for virtual machines that do not support incremental or differential backups' option was enabled for this job.
VM disk Fixed
Hyper-v integration tools - Update
This issue may occur when "Hardware" is chosen for the snapshot provider
You may try to use "Automatic" for the AOFO settings in the backup job definitions. This will allow the correct Cluster Shared Volumes writer (CSV) to be used for the backup
Refer this link for more info :-
Or please free to contact Veritas Technical support and open a new case for further proceedings
Is this issue with all VM's or only woith VM's with Fixed Disk.
Was this working before?
Which method of incremental are you currently using?
Is it Microsoft incremental or old style?
Can you attach the job log to this forum?