Backup fails and the event log states that it has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with the following error code 22155348129.

This error occurs because of SharePoint 2010 updates, in our case SharePoint 2010 service pack 1 had been applied through Windows updates. However the update process for SharePoint 2010 has changed. Now the updates have to be completed manually.

The following links give more detailed explanation:

http://msmvps.com/blogs/bradley/archive/2011/05/25/you-must-manually-run-psconfig-after-installing-sharepoint-2010-patches.aspx

http://blogs.technet.com/b/sbs/archive/2011/05/24/you-must-manually-run-psconfig-after-installing-sharepoint-2010-patches.aspx

The fix is to run the PSconfig utility.

1. From an administrative command prompt change directory to C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN.

2. Run PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures