I actually delete the original files from art.net and ftp the corrected files.
The working files are on my mac.
In Fetch in the menu bar is a pulldown called Remote
Go to --> Delete Directory or File...
This is pretty easy and keeps down on extra files.
Also I keep open the fetch transcript window which shows the unix equivalents of
 what is happening in the mac like fetch window.
MAM
Michael Maier      : In the feilds of observation
                             : chance favors only the mind
                             : that is prepared
                             :             -Louis Pastuer