While taking backup of Site Collection on SharePoint 2010 using powershell command "Backup-SPSite" I always encounter below error :

"Backup-SPSite : Exception from HRESULT: 0x80131904 At line:1 char:14

• Backup-SPSite <<<< -Identity http://< -Path <> + CategoryInfo : InvalidData: (Microsoft.Share...mdletBackupSite: SPCmdletBackupSite) [Backup-SPSite], SPException + FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletBackupSite"

I have a farm with 2 WFE, 1 App Server, 1 DB Server. I am farm administrator and performing backup on my appServer using PowerShell (Backup-spsite). I have all the rights as administrator on all the machines / drives / databases.

Well, site collection is more then 7GB in size. The Backup-spsite command runs for few mins and the resulting .bak file reaches 4.64 GB. I noticed that exactly at this size, it gets the exception mentioned above.

Below is the error which I saw in ULS viewer:

Error Category: InvalidData Target Object Microsoft.SharePoint.PowerShell.SPCmdletBackupSite Details NULL RecommendedAction NULL