I have looked at all the other posts about this problem, and none seem to appy to me. The last few errors in my Application event log were:
The backup operation that started at '2012-03-15T05:49:23.710392500Z' has failed with following error code '2147942402' (The system cannot find the file specified.). Please review the event details for a solution, and then rerun the backup operation
once the issue is resolved.
Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid(.DEFAULT). hr = 0x80070539, The security ID structure is invalid.
The backup was not successful. The error is: The system cannot find the file specified. (0x80070002).
I'm running Windows 7 64 bit and backing up to an external hard drive. Backup has worked fine for many months before this. Help!
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