Linux only: Back In Time, a Linux backup app inspired by Macs’ Time Machine and offering the same kind of no-worry, space-saving snapshot protection, is worth adding to your must-install list.
Why? First off, the user interface and documentation at its home page beat out similarly Time-Machine-inspired backup apps like previously mentioned Flyback, at least for my money. Second, it’s smart about being friendly with non-developer Linux users—it rewrites all the rules of the underlying rsync command in plain English in its settings, installs a “root” launching shortcut for when you want to back up your core system files, and adds itself to your cron automation engine automatically at the intervals you set it to, no crontab -e or other terminal jobs required.
Back In Time is a free download for GNOME or KDE-based Linux systems. Auto-updating repositories for Ubuntu and Fedora systems are posted at the Downloads page.