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Volume Mountpoints in Windows can lead to backup failures


Volume Mountpoints in Windows can lead to backup failures



Describe how mountpoints without drive letters can cause backup failures


In Windows it is possible to define an NTFS folder as a mountpoint. These mountpoints do not have drive letters.


A backup has failed.  In the backup summary output, you note the inability to identify information about a volume listing the following format with a "?" where the drive letter should be, and the GUID does not match any known partitions:

\\?\Volume {GUID}\


If the server is a physical machine, use the mountvol command for windows to remove the mountpoint.  The command:

MOUNTVOL /D \\?\Volume{UUID} will remove the mountpoint for the volume listed.

If the server is a virtual server, it should be possible to use VMWare or Hyper-V backups of the machine instead of the agent backups and obtain successful backups without removing the mountpoint.

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