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Win server 2012R2 - server backup - failed

Last Modified: 2016-02-12
Not sure what to do here ...

The backup operation that started at '?2016?-?02?-?11T07:01:14.778000000Z' has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with following error code '0x807800A1'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-Backup" Guid="{1DB28F2E-8F80-4027-8C5A-A11F7F10F62D}" />
  <TimeCreated SystemTime="2016-02-11T07:40:24.603414500Z" />
  <Correlation />
  <Execution ProcessID="18092" ThreadID="13840" />
  <Security UserID="S-1-5-18" />
- <EventData>
  <Data Name="BackupStartTime">2016-02-11T07:01:14.778000000Z</Data>
  <Data Name="BackupSetId">{1595F3BF-B196-4D0E-9007-49FCBB18424B}</Data>
  <Data Name="HRESULT">0x807800a1</Data>

Any help appreciated.
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