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Error 521 The backup operation has failed

Title: Error 521 The backup operation has failed

Product Version: Windows Backup Service, SBS 2011

Event ID: 521

Event Description:
=============
Log Name:      Application
Source:        Microsoft-Windows-Backup
Date:          10/2/2011 5:02:25 PM
Event ID:      521
Task Category: None
Level:         Error
Keywords:     
User:          SYSTEM
Computer:      MSSBS2011.sp-wall.local
Description:
The backup operation that started at '?2011?-?10?-?02T21:00:28.568000000Z' 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 '2155348129'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

Solution:
=======
Navigate to Control Panel > Administrative Tools > Computer Management > Storage > disk management to display list of hard disks. Now set your C:\ drive to be active by right clicking on it and selecting 'Mark Partition' as active.

Keyword: error 521, error event 521, error 521 backup, the backup operation has failed, error code '2155348129'

Reference: N/A

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