Hi , While taking SPFarm backup n sharepoint 2010. But when the command is preparing to backup of service account it is throughing the following error. To trobulshoot I am taking the service backup using the below command. But I am getting the error message as below. Comand Backup-SPFarm -Directory "c:\spBackup" -BackupMethod Full -Item "Farm\Shared Services\Shared Services Applications\Search Service Application 1" -Verbose Error [1/15/2013 4:14:32 PM] Verbose: [Access Services] Stored this object's parent type: Microsoft.Office.Access.Server.MossHost.AccessServerWebService [1/15/2013 4:14:32 PM] Verbose: [Access Services] Stored application pool name: SharePoint Web Services Default [1/15/2013 4:14:32 PM] FatalError: Object Access Services failed in event OnPrepareBackup. For more information, see the spbackup.log or sprestore.log file located in the backup directory. IdentityNotMappedException: Some or all identity references could not be translated. [1/15/2013 4:14:32 PM] Debug: at System.Security.Principal.SecurityIdentifier.Translate(IdentityReferenceCollection sourceSids, Type targetType, Boolean forceSuccess) at System.Security.Principal.SecurityIdentifier.Translate(Type targetType) at Microsoft.SharePoint.Administration.SPServiceBackupRestoreUtilities.StoreApplicationPoolInformation(SPBackupInformation info, SPIisWebServiceApplicationPool applicationPool) at Microsoft.SharePoint.Administration.SPIisWebServiceApplication.Microsoft.SharePoint.Administration.Backup.IBackupRestore.OnPrepareBackup(Object sender, SPBackupInformation info) at Microsoft.SharePoint.Administration.Backup.SPBackup.RunPrepareBackup(SPBackupRestoreObject node) All of my applicatiools are configured with the same service account from which I am taking backup. Please help me for the my query . Thanks Samir