NetWorker: Windows File System Backup for Azure Client is Missing Files
概要: Windows file system on Azure skips files although there is no NetWorker directive to do so.
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現象
Windows file system on Azure skips files although there is no NetWorker directive to do so.
Debug save output shows
Debug save output shows
87713:save: Found prototype specification for '\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1288\': skip : hiberfil.sys 87713:save: Found prototype specification for '\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1288\Areas Compartidas\':+ skip : *.*
原因
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,
- Open a command prompt as Administrator and run:
C:\> DISKSHADOW /l writers.txt DISKSHADOW> LIST WRITERS DETAILED DISKSHADOW> exit
- 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:\]
解決方法
Turn off VSS for backing up Azure storage volumes with the command:
VSS:*=off

NOTE: Only do this for clients that backup file system data. Performing a backup without VSS makes it impossible to backup the windows
DISASTER_RECOVERY:\ save set; meaning, Bare Metal Recovery (BMR) of the Windows VM would not be possible.
対象製品
NetWorker製品
NetWorker Family文書のプロパティ
文書番号: 000210906
文書の種類: Solution
最終更新: 04 3月 2026
バージョン: 3
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