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I have a 500 GB USB-disk which has been used as a backup device for a few years now, but now fails without telling me why.

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This is a Dell box with Intel USB-controllers (so the NVIDEA problem does not apply here). I have previously had problems with a Git package marking a non-existent directory for backup (adding it make the backup succeede). The inaccessible boot partition problem described in Windows Backup fails with 0x80070002: "The system cannot find the file specified" does not apply to me.

I would appreciate hints on where to look to identify why my backup fails so I can fix it.

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Have you made any system changes recently or altered any back up paths? –  Dave Rook Nov 23 '12 at 10:46
    
I have installed and uninstalled a few programs and done regular Windows updates (nothing pending). I have local administrator rights. –  Thorbjørn Ravn Andersen Nov 23 '12 at 11:22
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1 Answer

In my case this message coincided with this command output

vssadmin list shadowstorage
No items found that satisfy the query.

and the backup completed after this command

vssadmin resize shadowstorage /for=c: /on=c: /maxsize=1%
Successfully resized the shadow copy storage association

so that the output is changed to

vssadmin list shadowstorage
Shadow Copy Storage association
   For volume: (C:)\\?\Volume{GUID}\
   Shadow Copy Storage volume: (C:)\\?\Volume{GUID}\
   Used Shadow Copy Storage space: 0 B (0%)
   Allocated Shadow Copy Storage space: 0 B (0%)
   Maximum Shadow Copy Storage space: 1.117 GB (1%)
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