Anybody familiar with incremental backup knows that the de facto standard of backup utilities is a program called rsync. This is an unfortunate truth for Windows user's however because rsync is primarily a unix/linux application. DeltaCopy is a Windows backup program that takes advantage of rsync.

As far as file compression goes *.7z is one of the best. This application extends Windows' limited archive capabilities. I primarily use it for extracting archives that I download from the web. All Drupal modules and themes come packaged in a *.tar.gz ("tarball") archive, so I'm unarchiving a lot. The interface is very simple and uncomplicated. Extraction time is minimal, and the installer throws some nice options into the right-click context menu.

This program is basically a Mac alternative to the very helpful Windows program: Sequoia View. Both programs are used to display the sizes and types of files on a storage device in a graphical way called "treemaps". Specifically, using the language of Sequoia View, both apps display files and folders using "squarified treemaps". When you're concerned with unnecessary files consuming a lot of your hard disk space, these apps become invaluable to disk cleanup.