Windows Server Backup 2008R2 - VSS SID

Specific error:

Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid(S-1-5-21-4218825662-1428425431-4128574071-3123.bak).  hr = 0x80070539, The security ID structure is invalid.

Windows 2008R2 terminal server that is getting errors nightly on backup. Any ideas?
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Exchange_GeekConnect With a Mentor Commented:
Take a backup of the registry first

Open registry editor and go down to the following location

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\ProfileList

Check the entries for .bak against all the profiles - remove ".bak" by editing the profile.

Shut registry editor

And your issue would be solved.

Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Event ID 8193 — Volume Shadow Copy Service Operations

Check that the VSS service is enabled

To check that the VSS service is enabled and running.
    Click Start, point to Administrative Tools, and then click Services.
    In the results pane, double-click Volume Shadow Copy.
    Ensure that Startup type is set to Manual.
    Click OK.

- Rancy
lineonecorpAuthor Commented:
Volume Shadow Service is enabled and works normally with robocopy and all Windows Server 2008 Backups (ie. they are recoverable).

Thanks Exchange Geek,

I've made this change and will monitor the backup tonight to see if it still occurs.
lineonecorpAuthor Commented:
Implemented the change and the errors didn't appear in last night's backup.

Thanks for your help.
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