NetWorker: Windows File System Backup for Azure Client is Missing Files

87713:save: Found prototype specification for '\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1288\': skip : hiberfil.sys
87713:save: Found prototype specification for '\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1288\Areas Compartidas\':+ skip : *.*

The backup file system is on Azure storage volume. The system uses Volume Shadow copy Service (VSS) Writer "Sync Share Service Writer." It skips files by design. 

To verify that this is the cause,

1. Open a command prompt as Administrator and run: 

C:\>  DISKSHADOW /l writers.txt
DISKSHADOW> LIST WRITERS DETAILED
DISKSHADOW> exit

2. Look at the output file for writers.txt. If you see the below message, then that confirms the issue.

* WRITER "Sync Share Service Writer"
.////
and that writer contains Components with affected drive 
            - Components:
            - File List: Path = J:\DataFiles, Filespec = *.*
            - Paths affected by this component:
                - J:\DataFiles
            - Volumes affected by this component:
                               - \\?\Volume{c34a534a-63a2-4aee-b47a-e2092dc7a901}\ [J:\]

Turn off VSS for backing up Azure storage volumes with the command:

VSS:*=off