Determines the last time the physical file was:
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Copied from disk by a WFL COPY & BACKUP operation.
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Copied from disk by a WFL ARCHIVE BACKUP operation.
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Marked as having been backed up by a call on the MCP procedure MARK_FILE_BACKED_UP with the file as a parameter. Refer to “Declaring the MARK_FILE_BACKED_UP Procedure” in the Master Control Program (MCP) System Interfaces Programming Reference Manual for more information.
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Copied back to disk and library maintenance reset COPYSOURCEDATE to the CREATIONDATE.
 
Refer to the File Attributes Programming Reference Manual for a description of the BACKUPDATE file attribute.

