你好，
根据错误描述，我们可以尝试以管理员身份打开CMD然后运行下面命令：
Takeown /f %windir%\winsxs\temp\PendingRenames /a
icacls
%windir%\winsxs\temp\PendingRenames /grant "NT AUTHORITY\SYSTEM:(RX)"
icacls
%windir%\winsxs\temp\PendingRenames /grant "YourDomain\Domain
Admins":(RX)
icacls %windir%\winsxs\temp\PendingRenames /grant
"YourDomain\Domain Users":(RX)
icacls
%windir%\winsxs\temp\PendingRenames /grant "NT
Service\trustedinstaller:(F)"
icacls %windir%\winsxs\temp\PendingRenames
/grant BUILTIN\Users:(RX)
Takeown /f %windir%\winsxs\filemaps\*
/a
icacls %windir%\winsxs\filemaps\*.* /grant "NT
AUTHORITY\SYSTEM:(RX)"
icacls %windir%\winsxs\filemaps\*.* /grant "NT
Service\trustedinstaller:(F)"
icacls %windir%\winsxs\filemaps\*.* /grant
BUILTIN\Users:(RX)
net stop cryptsvc && net start
cryptsvc
net stop vss && net start vss
net stop Winmgmt
&& net start Winmgmt
注意： 我们需要用该server所在的环境替代yourdomain.
在运行完以上命令之后，我们需要重启一下server, 然后看问题还存不存在。
有关这类问题，下面的英文blog可以作为参考。
Backup Fails with Error Message "Writer Missing" or "Failed" or "Timed Out" or
"Waiting for Completion" in VSSADMIN
http://social.technet.microsoft.com/wiki/contents/articles/7309.backup-fails-with-error-message-writer-missing-or-failed-or-timed-out-or-waiting-for-completion-in-vssadmin.aspx
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