We have just cloned some of the disks in this 2008 R2 server to a new set of disks and have split some of the volumes to separate physical disks.

We now see that the backup is failing (Windows Server BaAckup) and that the following event is logged:

Log Name: Application
Source: VSS
Date: 08/12/2020 16:52:28
Event ID: 8193
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: SRV-EX1.domain.local
Description:
Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid(S-1-5-21-643322192-3791837119-3815354684-1162.bak). hr = 0x80070539, The security ID structure is invalid.
.

Operation:
OnIdentify event
Gathering Writer Data

Context:
Execution Context: Shadow Copy Optimization Writer
Writer Class Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
Writer Name: Shadow Copy Optimization Writer
Writer Instance ID: {da46ff96-6f82-4e8c-a145-3b47e4de2a95}
Event Xml:



8193
2
0
0x80000000000000

1146441
Application
SRV-EX1.domain.local



ConvertStringSidToSid(S-1-5-21-643322192-3791837119-3815354684-1162.bak)
0x80070539, The security ID structure is invalid.



Operation:
OnIdentify event
Gathering Writer Data

Context:
Execution Context: Shadow Copy Optimization Writer
Writer Class Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
Writer Name: Shadow Copy Optimization Writer
Writer Instance ID: {da46ff96-6f82-4e8c-a145-3b47e4de2a95}
2D20436F64653A20534543534543524330303030303931302D2043616C6C3A20534543534543524330303030303930332D205049443A202030303030353232382D205449443A202030303030343036302D20434D443A2020433A5C57696E646F77735C73797374656D33325C76737376632E6578652020202D20557365723A204E616D653A204E5420415554484F524954595C53595354454D2C205349443A532D312D352D313820