I implemented the 2 suggestions you made and got what looks like a successful result on both commands. Below is the screenshot.
I have also 'cut and pasted' the final section of the cbs.log which looks like a single corruption was found and fixed. So, I do not understand why the "Backup" attempt failed yet again.
CBS Log: (last section only)
2021-07-21 22:31:34, Info CSI 0000023c [SR] Verify and Repair Transaction completed. All files and registry keys listed in this transaction have been successfully repaired
2021-07-21 22:33:36, Info CBS Trusted Installer is shutting down because: SHUTDOWN_REASON_AUTOSTOP
2021-07-21 22:33:36, Info CBS TiWorker signaled for shutdown, going to exit.
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: ExecutionEngineFinalize
2021-07-21 22:33:36, Info CBS Execution Engine Finalize
2021-07-21 22:33:36, Info CBS Execution Engine Finalize
2021-07-21 22:33:36, Info CBS Deleting the contents of directory: \?\C:\WINDOWS\CbsTemp
2021-07-21 22:33:36, Info CBS Deletion of: \?\C:\WINDOWS\CbsTemp successful
2021-07-21 22:33:36, Info CBS Lock: Lock removed: TiWorkerClassFactory, level: 30, total lock:3
2021-07-21 22:33:36, Info CBS Lock: Lock removed: CCbsWorker, level: 5, total lock:2
2021-07-21 22:33:36, Info CBS Ending the TiWorker main loop.
2021-07-21 22:33:36, Info CBS Starting TiWorker finalization.
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: ExecutionEngineFinalize
2021-07-21 22:33:36, Info CBS CBS Engine already deactivated
2021-07-21 22:33:36, Info CBS CBS Engine already deactivated
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: ComponentAnalyzerFinalize
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: PackageTrackerFinalize
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: CoreResourcesUnload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: SessionManagerFinalize
2021-07-21 22:33:36, Info CBS Lock: Lock removed: CSIInventoryCriticalSection, level: 64, total lock:10
2021-07-21 22:33:36, Info CBS Lock: Lock removed: CCbsSessionManager, level: 11, total lock:9
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: CapabilityManagerFinalize
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: PublicObjectMonitorFinalize
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: Enter vCoreInitializeLock
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: WcpUnload
2021-07-21 22:33:36, Info CSI 0000023d Direct SIL provider: Number of files opened: 4.
2021-07-21 22:33:36, Info CSI 0000023e Direct SIL provider: Number of files opened: 2.
2021-07-21 22:33:36, Info CSI 0000023f Direct SIL provider: Number of files opened: 249089.
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: DrupUnload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: CfgMgr32Unload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: DpxUnload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: SrUnload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: CbsEsdUnload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: CbsTraceInfoUninitialize
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: CbsEventUnregister
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: AppContainerUnload
2021-07-21 22:33:36, Info CBS CbsCoreFinalize: WdsUnload, logging from cbscore will end.
2021-07-21 22:33:36, Info CBS Ending TiWorker finalization.
2021-07-21 22:33:36, Info CBS Ending the TrustedInstaller main loop.
2021-07-21 22:33:36, Info CBS Starting TrustedInstaller finalization.
2021-07-21 22:33:36, Info CBS Winlogon: Stopping notify server
2021-07-21 22:33:36, Info CBS Winlogon: Unloading SysNotify DLL
2021-07-21 22:33:36, Info CBS Lock: Lock removed: WinlogonNotifyLock, level: 8, total lock:6
2021-07-21 22:33:36, Info CBS Ending TrustedInstaller finalization.
