Backup failed due to insufficient permissions - Event 3353 (SharePoint 2010 Products)
Applies to: SharePoint Server 2010, SharePoint Foundation 2010
Alert Name: Backup failed due to insufficient permissions
Event ID: 3353
Summary: This error occurs when the account that is performing the backup does not have sufficient permissions to write to the backup folder.
When you back up a Web application, you back up the content databases and settings for the Web application, including all sites in the site collections, files in document libraries, files attached to lists, security and permission settings, and feature settings. The backup process creates files that contain all of this data.
Similarly, when you back up a site collection, site, or list, the contents of those structures will be written to files or packages, and the restore or import process will use these files to recover the objects.
Symptoms: This event might appear in the event log: Event ID: 3353 Description: Unable to write to the backup folder.
Cause: One or more of the following might be the cause:
The SQL Server service account does not have Full Control access to the backup folder.
The SharePoint Timer Service account does not have Full Control access to the backup folder.
If the backup or restore was performed by using Windows PowerShell, the user who performed the backup operation did not have Full Control access to the backup folder.
Resolution: Verify permissions
Ensure that the following are given the Full Control file share and NTFS permissions for the backup shared folder:
The account used by the SQL Server service account.
The Windows SharePoint Services Timer V4 (SPTimerV4) account.
The logged on account, if you are using Windows PowerShell to perform the backup or restore.
If the backup folder is a network share, ensure that all accounts that are listed above have access to both the share and the folder itself.
If you are performing a backup or restore operation between two SharePoint farms, services on both farms must have the permissions described above.
For more information, see Configuring permissions for backup and recovery (SharePoint Foundation 2010).