Hyper-V VM backup fails with VSS Error in Windows 2012 R2 Server

It would keep erroring out with some flush error saying that disk activity is too high and operation timed out. To fix this, set the registry settings as mentioned in the below article:

https://social.technet.microsoft.com/Forums/windowsserver/en-US/e00123c7-44a3-4f53-a726-8abca7e4542b/vss-error-server-2012-datacenter-application-12289-12297-12340-8194-system-9?forum=windowsbackup

At the registery (Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSer\Services\VSS\VssAccessControl
there a 2 values like this:

1. REG_DWORD --> DOMAIN\USERFULLPERMISSIONS --> set to 3 (0x0000003)
2. REG_DWORD --> NT Authority\NetworkService --> set to 3 (0x0000003)

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