windows server backup server 2012 standard edition. error 0x800423f4 Source: Vss Event id: 8229

Good Morning,
I have a problem with windows server backup server 2012 standard edition.
I just scheduled a backup of the entire system on a dedicated disk sas.
The backup always end with the same outcome:

disk c: Completed
disk d: Completed
disk recovery: Completed
Virtual machine xxx: Completed
Virtual machine yyy: Completed
Host component: Completed
Bare Metal Recovery: Backup failed to complete
System State: backup CANCELED. "System were backup was canceled."

Even if I try to make up each one of the "bare metal recovery" or the "system state" I get the same error.

By controlling the Windows event log I find the following message:
Log Application name
Source: Vss
Event id: 8229
Level: warning

A VSS writer Has rejected an event with error 0x800423f4, The writer experienced a non-transient error. If the backup process is retried, the error is Likely to reoccur.
Changes That the writer made to the writer components while handling the event will not be available to the requester.

Check the event log for related events from the application hosting the VSS writer.

Operation:
    PostSnapshot Event

context:
    Execution Context: Writer
    Writer Class Id: {b2014c9e-8711-4c5c-a5a9-3cf384484757}
    Writer Name: NTDS
    Writer Instance ID: {cf53a7fc-33ce-486b-b140-8985b6c910c2}
    Command Line: C: \ Windows \ system32 \ lsass.exe
    Process ID: 824


The server roles are: "Domain Controller" + "Exchange 2013" + "Hyper-V manager" with 32Gb RAM CPU 2.40GHz Intel Xeon E5-2609

I've done a lot of attempts to fix the problem type:
- Reboot the server several times
- In "diskpart" verify "AUTOMONT" is enable
- In the registry at HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows NT \ CurrentVersion \ ProfileList no entry with a .bak to be deleted
- Reset the Vss with the following commands:

  C:
CD \ Windows \ System32
Net stop vss
Net stop swprv
regsvr32 ole32.dll
regsvr32 vss_ps.dll
Vssvc / Register
regsvr32 / i swprv.dll
regsvr32 / i eventcls.dll
regsvr32 es.dll
regsvr32 Stdprov.dll
regsvr32 vssui.dll
regsvr32 msxml.dll
regsvr32 msxml3.dll
regsvr32 msxml4.dll


I await your response.
Thank You
Roberto

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Effecomp snc Montecchio Maggiore (VI)