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Re: Error message, after starting backup group

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I have found the problems and was able to fix them. Within the application log of Windows it has shown two VSS errors:

Event 8193

Volume Shadow Copy Service error: Unexpected error calling routine RegOpenKeyExW(-2147483646,SYSTEM\CurrentControlSet\Services\VSS\Diag,...).  hr = 0x80070005, Access is denied.

To fix that one, I had to give the NETWORK SERVICE user full access to that registry key. Within the details pane of the event log, you'll find the affected user. It looks something like this:

0090: 2D 20 55 73 65 72 3A 20 - User:
0098: 4E 61 6D 65 3A 20 4E 54 Name: NT
00a0: 20 41 55 54 48 4F 52 49 AUTHORI
00a8: 54 59 5C 4E 45 54 57 4F TY\NETWO
00b0: 52 4B 20 53 45 52 56 49 RK SERVI

Event 12293

Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {b5946137-7b9f-4925-af80-51abd60b20d5}. Routine details EndPrepareSnapshots({49a815d6-9ff2-473a-9659-72f81332a966}) [hr = 0x80070015, The device is not ready.

I found a lot of theories on what could be wrong. The simplest one helped me: assign a drive letter to the System Reserved partition in the disk manager for Windows.

Mondher
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Re: Error message, after starting backup group

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Hello,

I  have the same error and it worked when i give a name to the system reserved partition .

thank u.

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Praveen95
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Re: Error message, after starting backup group

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If the error says "NT-Authority\System" then my post will be helpful

You have to check the Permissions on failing drive (eg. Drive D:\) and make sure "SYSTEM" and "Administrators" (local admin not domain admin)  have full access. Because NT-Authority\System (S-1-5-18) points to local admin group and you won't be able to find under any group since it's a built in user. Restart the failing VSS writers and rerun the backup, it will be successful for sure. 

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