Live hyper-v export

Hello all:

I am trying to do a live export of my virtual machines as an additional backup.  I have 4 Hyper-v hosts all running Windows Server 2012 R2.  On 3 of the 4 servers, all of the machines export perfectly.  On the 4th however, only 5 of the 11 VMs will export live.  I get a "General Access Denied Error"  Error  A screenshot of the Error is attached.  
I have found no coloration between the machines that export and the ones that don't.  I am attempting all the exports using the same user account, and the VMs are stored in the same folder on the same drive.  I am also exporting them all to the same place - A USB drive, which has 1TB+ free space.  Guest OS is also not a factor, neither is whether they were created on that machine or imported in.
EccageekAsked:
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TropicalBoundCommented:
Compare the NTFS permissions of a VM that exports successfully against one that does not.
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TropicalBoundCommented:
Is this a HyperV clustered environment?  If so, can you fail them over to a different host and try the export again?
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EccageekAuthor Commented:
This machine is not clustered - it is stand alone.
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EccageekAuthor Commented:
Thank you TropicalBound!  After looking at the permissions for 2 VMs I found that the ones that would not export were missing the 'Virtual Machines' group.  I ran the script provided on this page, and it added the correct permissions.
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