I recently converted all my Linux boxes to use BTRFS filesystems. That allows for snapshots of each sub volume, and you can even send them (incrementally) to another btrfs drive. Last weekend I also set up btrbk, which gives you an environment to automate the process. It let's you snapshot any subvolume to a schedule you configure, and then send backups to any destination you specify via ssh, or even USB drives. Since these are incremental it uses very little bandwidth. It even has an archive function for long term storage, and just like the other backups you can define individual retention policies for each location. Did I mention it also supports non-btrfs support, encryption, and both host/server initiated backups? Awesome. Next weekend I'll set up encrypted archives to the cloud...