Windows Server Backup added wrong volume as a destination

On a Server 2008 R2 Standard machine we were having issues with backup drives and so removed them all and re-added.  The first one worked fine and we were able to get a successful backup, so we then added the remaining two drives.  On clicking Finish on the wizard, we then observed that a data drive disappeared, and on checking Disk Management we could see that the whole volume had been renamed using the Windows Server Backup format and formatted!  We are 100% certain that that drive wasn't selected as a backup destination, and on re-opening WSB and checking the destinations in use it wasn't listed, but the two ones we did mean to add were.  
This is obviously very worrying as we're now not sure if we'll ever be able to safely add or remove backup destinations on this or other machines in the future.  
Has anyone else experienced this?  Is there anything we can check to try and determine why this happened?

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This sounds very strange to be honest ,the only explanation I can come up with is a problem or confusion with volume names (drive names) after removing and re-adding.

It is possible that: drive1 was c: 2 was d: 3 was e:
and after removing and adding drive2 was e: and 3 was d:
So you didn't want to choose the drive as abackup ,but accidentally did!
This however doesn'y explain why you don't see it in the backup list!

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noxchoGlobal Support CoordinatorCommented:
This happens only if you accidentally select the wrong drive. There is no known case when it happened itself.
Check in Event Viewer if there is any event which says - creating backup task or job - and it should tell you which drive was selected actually.
mtxitAuthor Commented:
We never actually got to the bottom of this, and have marked it down as 'one of those things' - there was nothing in event log showing that a backup drive was added to the selections, and the drive didn't appear in the selections, but it did get formatted by Windows Server Backup!
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Windows Server 2008

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