Hi Jessica, great question! If you use ~/Desktop/Original, the command will copy the folder with all of the files inside it, so your destination path for the files inside of Original folder (after the sync) would be: ~/tmp/Original/files_you_synced. While if you were using ~/Desktop/Original/, then the Original folder itself wouldn’t be copied, only the files inside of it, so the destination path would be: ~/tmp/files_you_synced.
Hope this helps!

why not ‘~/Desktop/Original/’ but ‘~/Desktop/Original’?? The above command means sync all files in the remote server to local folder according to your explanation of “rsync -av –dry-run original/ duplicate/”.

Thanks!