Use a different type of action to copy the contents of one field to another. Use "Format value"
e.g. for HPATH:
Format string: %_path%
"Guess value" distributes to contents of one source field to other target fields and removes the information from the source field. You wouldn't want that for a backup.
Action #1 Actiontype 7: Import tag fields (guess values) Source format __: %COMMENT% Guessing pattern: %HCOMMENT%
End Action Group MY_BACKUP_ACTION (1 Action)
... or ...
Begin Action Group MY_BACKUP_ACTION
Action #1 Actiontype 5: Format value Field ______: HCOMMENT Formatstring: %COMMENT%
End Action Group MY_BACKUP_ACTION (1 Action)