Time Machine can't copy my hard drive

Time Machine can't copy my hard drive, it says that it can't complete the safety copy because an error occured when files were copied to the safety copy. Does anyone recognise this problem? All I could find in System notifications about Time Machine is this: "localhost kernel[0]: Security policy loaded: Safety net for Time Machine (TMSafetyNet)"

John Galt wrote:
... Are you unable to select the external HD as a backup device?
pres92 wrote:
that's the problem -- my hard drive ("startup disk) is not listed, so I can't select it.
The reason is that the startup volume is not a valid selection for its own Time Machine backup.
The only drive listed is the Time Machine external drive.  Obviously, I don't want to back up the time machine drive.
By default, a Time Machine backup volume is excluded from being backed up.
The appearance you describe is correct, otherwise I'm completely misunderstanding your problem.

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