Windows only: If you use multiple web browsers and email clients, MailBrowserBackup allows you to backup your profiles for each in one swoop. Currently MailBrowserBackup supports Mozilla Firefox, Google Chrome, and SRWare Iron in the browser arena, and Mozilla Thunderbird in the email arena. According to the author's release schedule the next release will increase support to include Opera, Safari, and Internet Explorer. Backing up Firefox and Chrome took only a few seconds on my system and the results were stored neatly in the directory I specified. Restoring was just as quick. The application is portable, but does require Microsoft .NET 2.0+ or above. MailBrowserBackup is open-source, Windows only.