I think I'm missing something on how pathnames are supposed to work in Selector expressions in Retrospect v4.0. I can't get get an expression like "Folder pathname ends with Folder:Cache" to work when I try to select Netscape's cache files. (I was setting up a selector to keep Retrospect from backing up those files.) Also using the entire, copy-and-pasted pathname (ie, "Folder pathname exactly matches Macintosh HD:Netscape Navigator....") didn't work either. Very frustrating.
Instead I had to use two expressions with an 'and', like "Enclosing folder name contains netscape and folder name contains cache". That works just fine, but I'm still troubled why my attempt to use pathname didn't work.