Hello,
What are you backing up from the D: drive? Are you also backing up some directories or files that were deleted before but are present in the job selection?
Refer to the following technotes in order to resolve the problem and have successful backups:
Ttile:A backup operation fails with the error message: "Directory not found. Can not back up directory <\directory> and its subdirectories" or "The directory is invalid."
http://support.veritas.com/docs/207001
Ttile: Job fails with the error: "Directory not found. Cannot backup directory \ and its sub-directories."
http://support.veritas.com/docs/245452
Hope this helps. In case of more queries, revert to the forum with details.
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Regards.