Here's an AppleScript droplet to compress files and folders with the
unix utility "gnutar" which comes with the Apple Developer Tools. This
script equals to manually typing "gnutar zcf" with Terminal. You can
have a choice whether to add suffix or not. By default, the suffix is
the date in yyyymmdd format. I build this script to save myself a few
seconds every time I back up my files (which happens many times daily).
This script is provided to you "AS IS" and the responsibility for its
operation is yours.