Thank you for your response. PLease see my answers below.
What OS version for Hyper-V [Win 2012, Win 2012R2, Win 2016]?
A: Win 2012R2
Can you attach teh job log?
A: attached
Are Integration services updated on all the VM's?
A: Yes. Integration Services are updated.
Are all the agents updates?
A: Yes. agents are updated.
Does this happen for specific VM's or all Vm's?
A: All VMs.
If for specifc VM's then can you share the difference on how these VM's are configured in terms of Disks and other aspects?
A: I have added hyper-v hosts and taking agent less backups for all machines including all disks no exceptions.
Are you using the Faster processing method for Incremental Hyper-V backups Or the original method being called the Standardprocessing method ?
Previously I was using Faster method and switching it to Standard didn't effect anything except it stopped creating more snapshots that is a big headache with Faster method as it was unable to remove snapshot and running every two hour backup job was creating like hundreds pe rmonth.
Note: I hav tested Veeam backup solution (Backup and replication) and it took backup of 400 GB SQL only in 70 GB and incrementals was few MBs only. I tested other mahcines and they was also very small size and very fast and loow size incrementals.
Faizan