Windows Backup Failing after first run

Windows server 2012 Essentials, 2 Seagate 1TB drives.

I am using windows backup running on a schedule to perform backups to a pair of external drives.  What happens is the first scheduled backup runs like it should but the next one does not.

Is there a requirement to swap out the drives between backups or will they back up to the same drive 2 days in a row without issue?

Any ideas on why?
ACUIWebDeveloperAsked:
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Carol ChisholmCommented:
It should back up to the same drive with no issues.
Do you have anything in your event log?
You could try offline/online the disk with diskpart to make sure

C:\Windows\System32\diskpart.exe /s C:\Scripts\offlinedisk4.cmd
C:\Windows\System32\diskpart.exe /s C:\Scripts\onlinedisk4.cmd

OfflineDisk4.cmd contains these lines
select disk 4
offline disk

And online is the same except it has online.
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ACUIWebDeveloperAuthor Commented:
I have not forgotten about this, I just don't have access to the server at the moment.  i will update shortly.
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ACUIWebDeveloperAuthor Commented:
Update:

Hi Carol, I have tried offline-ing the disks with no success.  I have combed through the event logs and I don't see anything related to the windows backup that throws a flag.  I have put a 3rd part backup solution in place which seems to be working.  I just don't have the time to spend digging any deeper.  Thanks for the help.  I may come back to this in some mythical future free time...
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Windows Server 2012

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