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I have a couple of Windows Server 2012 VM's I need to backup. Everything works fine on all but one machine.

No matter where I choose to store the backup, it fails almost immediately with:

Backup failed to complete. There was a failure in preparing the backup image of one of the volumes in the backup set. Detailed error: The specified backup disk cannot be found.

This happens if I use an attached iSCSI volume, or for testing I tried a share to a 2008R2 server. The "WindowsImageBackup" folder structure appears on the backup target.

I the event log I get:

The backup operation that started at '‎2013‎-‎05‎-‎09T16:44:47.343260900Z' has failed with following error code '0x807800C5' (There was a failure in preparing the backup image of one of the volumes in the backup set.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

And in the C:\Windows\logs\WindowsServerBackup error log I see:

Backup of volume \?\Volume{ea169114-77ab-11e2-93e7-806e6f6e6963}\ has failed. The specified backup disk cannot be found.

Another guest VM with the exact same backup settings works perfectly fine. The only difference is this machine is a domain controller and the other is an Exchange 2010 server.

Any suggestions would be appreciated.

Adding vssadmin list writers output:

vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool (C) Copyright 2001-2012 Microsoft Corp.

Writer name: 'Task Scheduler Writer' Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124} Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b} State: [1] Stable Last error: No error

Writer name: 'VSS Metadata Store Writer' Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06} Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93} State: [1] Stable Last error: No error

Writer name: 'Performance Counters Writer' Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2} Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381} State: [1] Stable Last error: No error

Writer name: 'System Writer' Writer Id: {e8132975-6f93-4464-a53e-1050253ae220} Writer Instance Id: {e8b9d601-fa02-4d94-8b2c-8621a202ef72} State: [1] Stable Last error: No error

Writer name: 'ASR Writer' Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4} Writer Instance Id: {1c248721-b8d1-47d9-aa80-5d61bbb8b52d} State: [1] Stable Last error: No error

Writer name: 'Shadow Copy Optimization Writer' Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f} Writer Instance Id: {9f8b055f-63a6-4cb3-b17e-3c9a303af661} State: [1] Stable Last error: No error

Writer name: 'FRS Writer' Writer Id: {d76f5a28-3092-4589-ba48-2958fb88ce29} Writer Instance Id: {b50f047c-7c30-4738-b40c-f4ea3b0cb440} State: [1] Stable Last error: No error

Writer name: 'COM+ REGDB Writer' Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f} Writer Instance Id: {a13bb452-9d7b-4229-8b27-4abf21e570a1} State: [1] Stable Last error: No error

Writer name: 'Registry Writer' Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485} Writer Instance Id: {636da5ab-dcc2-4a74-b583-2754f44718de} State: [1] Stable Last error: No error

Writer name: 'BITS Writer' Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0} Writer Instance Id: {d79fd218-5189-4a69-b229-948801bdff7b} State: [1] Stable Last error: No error

Writer name: 'NTDS' Writer Id: {b2014c9e-8711-4c5c-a5a9-3cf384484757} Writer Instance Id: {ff77a651-f07c-4a9e-9104-9d8f58fd8cd2} State: [1] Stable Last error: No error

Writer name: 'WMI Writer' Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0} Writer Instance Id: {3a00c32e-7d67-43e7-8b38-5398241f9b11} State: [1] Stable Last error: No error

Writer name: 'Certificate Authority' Writer Id: {6f5b15b5-da24-4d88-b737-63063e3a1f86} Writer Instance Id: {5e5ed7ba-f8b4-4e53-953d-32175fcd94ef} State: [1] Stable Last error: No error

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can you verify that the VSS writers are fine? "vssadmin list writers" on the problem server. –  TheCleaner May 9 '13 at 18:06
    
There are 13 writers listed and all say "No error". –  Tamerz May 9 '13 at 18:15
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2 Answers 2

Have you tried (just as a test) to make the backup on an external drive? Are you running any Antivirus that may result this issue? Has the backup worked before on that machine? If yes, did you change something recently that may have end to the issue? Have you read this? http://answers.microsoft.com/en-us/windows/forum/performance/backup-error-0x807800c5/95959b0d-8f2b-4bcb-adb7-ecac48b6c239

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I have not tried an external drive (other than iSCSI of course). I don't currently have physical access to the machine, but it is something I can arrange. It is running Trend Micro, but so is the other machine that works fine. Just to be safe I just disabled it and tried again with no success. The backup has never worked, this is a brand new install. I had not seen that link, but it doesn't seem to apply here. I am using a completely empty folder/drive to back up to. –  Tamerz May 9 '13 at 21:17
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up vote 0 down vote accepted

I installed today's updates and rebooted and it now appears to be working. Something must have just been in a strange state. Thanks for the replies.

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