Strange problem with virtual machines backup (Hyper-V 2012R2)

Hi
I have a strange problem with backup of virtual machines in one of my Hyper-V environments. Let me describe how does it looks like: There are two physical servers - HP DL360 G8. They are used as hosts for four virtual machines - domain controllers in two domains.
Each of them runs one DC in every domain. I've configured backup "inside" every virtual machine (with Windows Server Backup tool), in its operating system, because domain controllers should have their system state, regularly backuped, etc. Backup
is made on the network share - all machines to the same server as destination. And now the case - two virtual server are backuped as expected - the operation takes 3 - 4 minutes and is always succeded. But in case of two remaining it looks as below:
- Backup operation starts (is scheduled).
- Volume shadow copy is made.
- The first partition of VM starts to be copied. It's Windows 2012 R2 Generation2 VM, so it has EFI, Recovery and C: partition. EFI is as first and at this moment backup stucks for a 2-3 hours! Progress of copying is 0%. After for example 3 hours this partition
is completed and starts the next (disk C:). And again - it freezes for a few hours and suddenly is pushed. As a result the backup is made successfully, but it takes for example 10 hours.
Both "dodgy" VMs are on separated hosts. All four of them were installed in the same time. I tried to change destination to locally connected disk, but no result. It's interesting as well, that after rebooting VM, the first backup is made normally,
but every next has described problem again. In EventLog I can't find any errors, I don't know how to diagnose such case precisely, etc. Have you got idea what can cause such behaviour or where on the server should I look for some hints?
Thanks
Marcin

Hi Marcin,
>>that after rebooting VM, the first backup is made normally, but every next has described problem again.
It shouldn't happen .
To narrow this issue down , Please try to backup an Gen1 VM and check the result .
Best Regards
Elton JI
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

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    Oct 28 09:52:53 MBA /System/Library/CoreServices/backupd[8464]: Backup completed successfully.
    Oct 28 09:53:11 MBA /System/Library/CoreServices/backupd[8464]: Attempt to eject diskimage failed with status: -47, dissenting pid: 0
    Oct 28 10:23:16 MBA /System/Library/CoreServices/backupd[8603]: Starting standard backup
    Oct 28 10:23:19 MBA /System/Library/CoreServices/backupd[8603]: Network volume mounted at: /Volumes/MPTC-1
    Oct 28 10:23:27 MBA /System/Library/CoreServices/backupd[8603]: Disk image /Volumes/MPTC-1/MBA_001f5bd2c764.sparsebundle mounted at: /Volumes/Backup of MBA
    Oct 28 10:23:27 MBA /System/Library/CoreServices/backupd[8603]: Backing up to: /Volumes/Backup of MBA/Backups.backupdb
    Oct 28 10:23:28 MBA /System/Library/CoreServices/backupd[8603]: Error: (-50) Creating directory 2008-10-28-102328.inProgress
    Oct 28 10:23:28 MBA /System/Library/CoreServices/backupd[8603]: Failed to make snapshot container.
    Oct 28 10:23:33 MBA /System/Library/CoreServices/backupd[8603]: Backup failed with error: 2
    Oct 28 10:23:33 MBA /System/Library/CoreServices/backupd[8603]: Attempt to eject diskimage failed with status: -47, dissenting pid: 0
    Oct 28 11:23:16 MBA /System/Library/CoreServices/backupd[8729]: Starting standard backup
    Oct 28 11:23:16 MBA /System/Library/CoreServices/backupd[8729]: Network volume mounted at: /Volumes/MPTC-1
    Oct 28 11:23:20 MBA /System/Library/CoreServices/backupd[8729]: Disk image /Volumes/MPTC-1/MBA_001f5bd2c764.sparsebundle mounted at: /Volumes/Backup of MBA
    Oct 28 11:23:20 MBA /System/Library/CoreServices/backupd[8729]: Backing up to: /Volumes/Backup of MBA/Backups.backupdb
    Oct 28 11:23:21 MBA /System/Library/CoreServices/backupd[8729]: Error: (-50) Creating directory 2008-10-28-112321.inProgress
    Oct 28 11:23:21 MBA /System/Library/CoreServices/backupd[8729]: Failed to make snapshot container.
    Oct 28 11:23:26 MBA /System/Library/CoreServices/backupd[8729]: Backup failed with error: 2
    Oct 28 11:23:26 MBA /System/Library/CoreServices/backupd[8729]: Attempt to eject diskimage failed with status: -47, dissenting pid: 0
    Oct 28 11:24:05 MBA /System/Library/CoreServices/backupd[8729]: Stopping backupd to allow ejection of backup destination disk!
    Oct 28 11:24:11 MBA /System/Library/CoreServices/backupd[8747]: Backup requested by user
    Oct 28 11:24:11 MBA /System/Library/CoreServices/backupd[8747]: Starting standard backup
    Oct 28 11:24:11 MBA /System/Library/CoreServices/backupd[8747]: Network volume mounted at: /Volumes/MPTC-1
    Oct 28 11:24:12 MBA /System/Library/CoreServices/backupd[8747]: Disk image /Volumes/MPTC-1/MBA_001f5bd2c764.sparsebundle mounted at: /Volumes/Backup of MBA
    Oct 28 11:24:12 MBA /System/Library/CoreServices/backupd[8747]: Backing up to: /Volumes/Backup of MBA/Backups.backupdb
    Oct 28 11:24:12 MBA /System/Library/CoreServices/backupd[8747]: Error: (-50) Creating directory 2008-10-28-112412.inProgress
    Oct 28 11:24:12 MBA /System/Library/CoreServices/backupd[8747]: Failed to make snapshot container.
    Oct 28 11:24:17 MBA /System/Library/CoreServices/backupd[8747]: Backup failed with error: 2
    Oct 28 11:24:17 MBA /System/Library/CoreServices/backupd[8747]: Attempt to eject diskimage failed with status: -47, dissenting pid: 0

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