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wbadmin command line backup to UNC fails

I'm having trouble with an wbadmin.exe backup script on Windows Server 2008 R2 Standard. I have a scheduled backup running in the GUI that backs up to USB drives, I want to use wbadmin scripts and task scheduler to add backups to a UNC share at a remote office for offsite backups. But when I test the command line script it runs for a couple minutes and the I get this error:

The backup operation stopped before completing.
Detailed error: The parameter is incorrect.
One of the backup files could not be created.
The parameter is incorrect.

I started with this command:
Wbadmin start backup -backupTarget:\\server\share -include:c:\,d:\ -allCritical -systemState -noVerify -user:username -password:pw -noInheritAcl

then I simplified it to this for troubleshooting:
wbadmin.exe start backup -allcritical -backuptarget:\\server\bmrshare

I get the same error with both scripts.  I'm copying and pasting the commands from notepad into an elevated command prompt for testing, I haven't attempted to schedule them yet.

The remote share is a shared folder on an external USB drive connected to a server at the remote\branch office. I gave the everyone object full permissions in both the security and sharing tabs on the shared folder.  From the server I'm backing up I can browse to the backup share and create\modify\delete a file.

The backup does create the WindowsImageBackup folder on the remote share before failing, along with sub folders and files including the .vhd file. Attached is a wordpad doc with screen shots of all the folders and files it manages to create.
BackupFoldersCreated.rtf
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precisenets
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precisenets
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3 Solutions
 
precisenetsAuthor Commented:
Also the USB drive that holds the remote share is an Segate Backup Plus 3TB that I quick formated to NTFS.
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MdlinnettCommented:
Try 'wbadmin start backup -backuptarget:\\server\bmrshare -allcritical'

I've just compared your script to one that I'm using on an SBS 2008 Server which I had to do a lot of trials with to get working.

The full command running on my SBS 2008 which has been working for some time is:

'wbadmin start backup -backuptarget:\\Server\Share -include:c:,f:,g: -allCritical -vssFull -quiet'
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precisenetsAuthor Commented:
I tried both of your examples and I still get the same error.
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precisenetsAuthor Commented:
I tried using a UNC share in the same building and it is working, Im thinking the problem is related to the MPLS line I'm trying to run the backup over. Normal network shares and mapped drives work fine over this connection. Are there extra ports that need to be open for Windows Server 2008 R2 backup? Unfortunately the firewalls on the MPLS line are managed by a third party so I'll have to go through them to troubleshoot.
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precisenetsAuthor Commented:
I've turned off AV on both source and destination systems and the problem persists.
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precisenetsAuthor Commented:
Ok, I was barking up the wrong tree, it's not related to the UNC path, it's that the share was on a 3TB seagate drive with advanced 4k sector formatting.
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MdlinnettCommented:
I see... glad you got a solution :)
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precisenetsAuthor Commented:
Thank you for your reply.
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