With the MozBackup utility you can create backups of your favorite Mozilla programs and profiles. You can backup and restore bookmarks, mail, contacts, history, extensions, passwords, cache and everything else that may be installed as addons / extensions for your program.
Among the applications you can use this program for we have Firefox, Thunderbird, Flock, Sunbird, SeaMonkey and more.
Really, backup apps are dying out. With the proliferation of the cloud storage model, backups will soon be a common feature to all operating systems and individual application. We can already see this happening in the mobile app scene.