UrBackup on Windows 10 Pro Image backups fail with "Creating shadow copy failed"

(Sorry if you read this earlier when I had the version of Windows wrong)

I’m running the client v2.4.11 on Windows 10 Pro v 21H2. The server is running v2.4.14.

File backups appear to be working fine but Image backup fails every time. The message is “Request of image backup failed. Reason: Creating shadow copy failed. See client log file for details.” and the debug.log shows:

2022-06-15 16:27:23: ERROR: backupcom->AddToSnapshotSet(&(Server->ConvertToWchar(selected_vols[i])[0]), GUID_NULL, &additional_refs[i].volid) failed. VSS error code VSS_E_UNEXPECTED_PROVIDER_ERROR
2022-06-15 16:27:23: ERROR: VSS provider information:
2022-06-15 16:27:23: ERROR: Provider name: ‘Hyper-V IC Software Shadow Copy Provider’
2022-06-15 16:27:23: ERROR: Provider type: Software
2022-06-15 16:27:23: ERROR: Provider Id: {74600e39-7dc5-4567-a03b-f091d6c7b092}
2022-06-15 16:27:23: ERROR: Version: 1.0.0.0
2022-06-15 16:27:23: ERROR: Provider name: ‘Microsoft Software Shadow Copy provider 1.0’
2022-06-15 16:27:23: ERROR: Provider type: System
2022-06-15 16:27:23: ERROR: Provider Id: {b5946137-7b9f-4925-af80-51abd60b20d5}
2022-06-15 16:27:23: ERROR: Version: 1.0.0.7
2022-06-15 16:27:23: ERROR: Creating shadowcopy of “C:” failed.
2022-06-15 16:27:23: ERROR: Creating shadow copy failed. See client log file for details.

Any thoughts or suggestions welcome please :slight_smile:

Thanks

Dik

So I googled “VSS_E_UNEXPECTED_PROVIDER_ERROR” and found this page:
https://www.veeam.com/kb1785
which suggested the problem is that I have more than one VSS running, I ran the “vssadmin list providers” command and sure enough there are two (I know nothing of these things so only now spotted that the rest of the debug lines above actually list the two providers).
I have taken a stab and disabled the “Hyper-V IC Shadow Copy Provider” service in the services app but still got the same error.
So it appears the only way is for me to remove Hyper-V from the registry list of providers - am I the only one that is finding this all a bit much and surely I am not the only one having this issue on Windows 10?
Anyway, I backed up up the registry entry ([HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VSS\Providers{74600e39-7dc5-4567-a03b-f091d6c7b092}]) and then deleted it.
I then set an image backup running and now it just keeps trying but reporting nothing in either the client logs or the debug log (so I can see the image backup starting, getting to 87% then just stopping and it appears to try every 5 minutes - but the debug log is still showing the last attempt before I removed Hyper-V).
So now I reboot, I’ll reply again with the result of that…

If you dont’t have a clue about VSS, you can download VSS Doctor from Acronis for free:

https://www.acronis.com/en-sg/products/vss-doctor/

It’s easy to use and fixes almost everything on VSS.

Best

Knut