Script will not accept target volume when setting Windows Backup policy

Question

I have manually configured a Windows Backup on a VM using the GUI. I set the target volume for the backup and it works fine. However, I am trying to script out the configuration of the backup and when I run the script, I get the following output:
Label                  : Backup
WBDisk                 :  \\ ?\Volume{96ab04f0-5a45-11e4-80f1-00155dbae602}
WBVolume               : Backup (E:)
Path                   :
TargetType             : Volume
InheritAcl             : False
PreserveExistingBackup : False
Date        : 10/23/2014 12:00:00 AM
Day         : 23
DayOfWeek   : Thursday
DayOfYear   : 296
Hour        : 0
Kind        : Unspecified
Millisecond : 0
Minute      : 30
Month       : 10
Second      : 0
Ticks       : 635496210000000000
TimeOfDay   : 00:30:00
Year        : 2014
DateTime    : Thursday, October 23, 2014 12:30:00 AM
Date        : 10/23/2014 12:00:00 AM
Day         : 23
DayOfWeek   : Thursday
DayOfYear   : 296
Hour        : 6
Kind        : Unspecified
Millisecond : 0
Minute      : 30
Month       : 10
Second      : 0
Ticks       : 635496426000000000
TimeOfDay   : 06:30:00
Year        : 2014
DateTime    : Thursday, October 23, 2014 6:30:00 AM
Date        : 10/23/2014 12:00:00 AM
Day         : 23
DayOfWeek   : Thursday
DayOfYear   : 296
Hour        : 12
Kind        : Unspecified
Millisecond : 0
Minute      : 30
Month       : 10
Second      : 0
Ticks       : 635496642000000000
TimeOfDay   : 12:30:00
Year        : 2014
DateTime    : Thursday, October 23, 2014 12:30:00 PM
Date        : 10/23/2014 12:00:00 AM
Day         : 23
DayOfWeek   : Thursday
DayOfYear   : 296
Hour        : 18
Kind        : Unspecified
Millisecond : 0
Minute      : 30
Month       : 10
Second      : 0
Ticks       : 635496858000000000
TimeOfDay   : 18:30:00
Year        : 2014
DateTime    : Thursday, October 23, 2014 6:30:00 PM
Set-WBPolicy : The specified file path does not exist or is not on a locally attached disk.
At D:\Admin\Configure_Backup.ps1:44 char:1
+ Set-WBPolicy -force -policy $BackupPolicy
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Set-WBPolicy], Exception
    + FullyQualifiedErrorId : System.Exception,Microsoft.Windows.ServerBackup.Commands.SetWBPolicy
The E: volume is one of three drives for the VM.  I attach and detach the volume from the Hyper-V host weekly - creating a new VHD for each week of backups.  This all works fine with me doing it manually, but I want to automate the process and
the script below won't let me.  IDEAS???
# Open the existing policy in Edit mode
$BackupPolicy = Get-WBPolicy -Editable
# Now,define the parts of it.
# First,let's specify the files to backup
$FileSpec = New-WBFileSpec -Filespec C:\,D:\
# and then add that to the policy we're building
Add-WBFileSpec -policy $BackupPolicy -filespec $FileSpec
# Remove the existing target
$Target = Get-WBBackupTarget -Policy $BackupPolicy
Remove-WBBackupTarget -Policy $BackupPolicy -Target $Target
# Add the new target
$Target = New-WBBackupTarget -VolumePath E:
Add-WBBackupTarget -policy $BackupPolicy -target $Target
# Add System State and Bare Metal Recovery
Add-WBSystemState -policy $BackupPolicy
Add-WBBareMetalRecovery -policy $BackupPolicy
# Define the schedule
Set-WBSchedule -policy $BackupPolicy -schedule 00:30,06:30,12:30,18:30
# Finally, set for VSS Copy Backup
Set-WBVssBackupOptions -policy $BackupPolicy -VssCopyBackup
# Finally, we need to SET the policy before it actually takes control
Set-WBPolicy -force -policy $BackupPolicy

Answer 1

Hi Dan,
Since you want to replace the destination volume for the existing backups, I recommend you can delete the existing backup task and create a new backup task, or you can also try the steps below:
Reattach the original (old) volume and also attach the new volume to VM, then run the powershell script to
add the new target volume firstly, then remove the old volume, after you run the script you can detach the original volume from VM.
If there is anything else regarding this issue, please feel free to post back.
Best Regards,
Anna Wang