Beta two was just combining Backup Folder and Delete Sync. This was mostly copy and paste, though I did some variable renaming to make it look a bit better. Beta three was just a bunch of bug fixes. After Beta three there was one major outstanding issue which has mostly been fixed with Beta four. But that may have left Beta four unstable so Beta five will likely be more bug fixes.

One thing I couldn't do with the log output to file was append \r\n to the end of each line. Script Editor didn't like \n, so I'm left with leaving it in Mac format. Also, annoyingly Script Editor still insists of converting \r into actual line endings, which makes the program listing a bit messy. Note that when I first write to the file I take care to start at the end of the file, so I won't overwrite it. Unfortunately, the choose file will give a "this file will be replaced" warning if you choose an existing file.

The big issue after Beta 3 was that I couldn't copy applications. Actually, I could copy some applications but not others. It took me a couple of hours of thinking and testing to realize that it had problems with Application Frameworks. These are the application folders recently introduced, where the application is actually a regular folder structure tagged as an application. To make it easier for users, the Finder automatically displays Application Frameworks as a file rather than a folder.

That's fine and dandy, but the crux of my problem was that Application Frameworks frequently end with ".app", which the Finder hides. Hides even from AppleScript. Meaning that, when I get a list of folder contents, the applications have ".app" stripped. Then when I try to get the application file I get an error because it doesn't exist. Fine, I can add ".app" to the application name and then get it fine. But if I try to get any information from the application object I get an error because AppleScript doesn't use ".app".

      -- Cycle through items in the current folder and process each item
      set l_items to list folder of l_current_folder
      
      repeat with l_source_item_name in l_items
        
        set l_source_invalid to false
        
        try
          set l_source_item to (item (l_source_item_name as string) of l_current_folder) as file specification
          set l_source_info to my addIsFolderAttribute(info for l_source_item)
          set l_copy_item to false
          set l_dest_item to ""
          set l_dest_info to ""
          set l_source_app to false
        on error l_error
          set l_source_invalid to true
          log "*****Error processing source item " & l_current_folder & l_source_item_name
          log "*****" & l_error
          if (class of m_log_file is file specification) then
            write "*****Error processing source item " & l_current_folder & l_source_item_name & "
" to m_log_file
            write "*****" & l_error & "
" to m_log_file
          end if
        end try

As the above code shows, the solution is to not use the Finder. The Standard Additions Dictionary contains some Finder-like commands that don't use Finder objects. list folder {file specification} merely returns the text names of the folder contents, rather than the items themselves. The names are the actual names, including ".app" for Application Frameworks. As a bonus, you also get invisible items too.