备份SharePoint 2010(使用PowerShell-备份SPFarm)

我在ServerFault上问过这个问题,但是没有得到任何回复,我知道这是命令行,但是他们仍然可以回答,这里有人知道吗?

我已经运行了以下程序( task description ):

> Add-PsSnapin Microsoft.SharePoint.Powershell
> Backup-SPFarm -Directory E:\Backups -BackupMethod Full

但是得到这个错误:

Backup-SPFarm : Object reference not set to an instance of an object.
At line:1 char:14
+ Backup-SPFarm <<<<  -Directory \\SHAREPOINTSERV\Backups -BackupMethod full
    + CategoryInfo          : InvalidData: (Microsoft.Share...mdletBackupFarm:SPCmdletBackupFarm) [Backup-SPFarm], NullReferenceException
    + FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletBackupFarm

我可以通过管理站点手动备份,以便正确设置所有服务/权限。

我 can't find much helpful info on this 有人知道我为什么收到这个错误消息吗?

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不确定是否相关,但我是一个开发人员,以前从未使用过PowerShell(以前也没有在这台机器上使用过)。所以我唯一的猜测是,是否有某种先决条件是我应该跑过去或知道的?

编辑: 冗长输出

PS E:\Backups\Script> Backup-SPFarm -Directory E:\Backups -BackupMethod Full -Verbose
VERBOSE: Leaving BeginProcessing Method of Backup-SPFarm.
VERBOSE: Performing operation "Backup-SPFarm" on Target "SHAREPOINTSERV".
Backup-SPFarm : Object reference not set to an instance of an object.
At line:1 char:14
+ Backup-SPFarm <<<<  -Directory E:\Backups -BackupMethod Full -Verbose
    + CategoryInfo          : InvalidData: (Microsoft.Share...mdletBackupFarm:SPCmdletBackupFarm) [Backup-SPFarm], NullReferenceException
    + FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletBackupFarm


VERBOSE: Leaving ProcessRecord Method of Backup-SPFarm.
VERBOSE: Leaving EndProcessing Method of Backup-SPFarm.