Backing Up Hyper-V Virtual Machines with dynamic vhdx disks attached

Question

Hi folks.
Can i  make an online backup
for a virtual machine that has a hard drive
attached  dynamic vhdx running on
windows server 2012 r2?
Regards

Answer 1

I think we should try to duplicate this using diskshadow.exe to create a persistent snapshot and manually copy a VM.
1) On the hyper-V host open an administrative command prompt.
2) Run diskshadow.exe - and after it starts enter the following commands as written except for the drive letters used:
   Diskshadow> Set Verbose on
   Diskshadow> Set context Persistent
   Diskshadow> Add Volume X: ALIAS xvol    (Where
X: is the drive letter of the volume containing the Hyper-V guests you want to make a snapshot for)
   Diskshadow> Begin backup
   Diskshadow> create                   
   Diskshadow>end backup
   DiskShadow> Expose %xvol% S:              (Where S: is a free drive letter)
3) Now Go into explorer and copy out VM's from the S: Drive which is the live shadow copy and see if that duplicates your problem.
When you are done, delete the shadow copy in diskshadow using the following command.
   DiskShadow>Delete shadows exposed S:  
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