Backshift is a deduplicating (variable-sized, content-based blocks), compressing (xz or bz2) backup program. Full saves and incrementals are pretty indistinct other than the amount of data transmitted, somewhat like with "rsync --link-dest" but without the huge number of hardlinks. It also de-duplicates large file content at a granularity of about 2 megabytes on average; there tends to be a unique copy of each file with size less than around 2 megabytes on average.
DragonDisk is a powerful file manager for S3 compatible cloud storage services, such as Amazon S3 and Google Cloud Storage. It allows you to back up, share, and organize your data thanks to an intuitive interface. Features include multiple windows; copy / move between Amazon S3 accounts; a multi-threaded HTTP/HTTPS engine; drag and drop; rename files and folders; filename filters; BiTorrent, time limited, and signed URLs; client side encryption; a metadata editor; ACL inheritance; detailed operations logs; and support for versioning.
DarGUI is a graphical frontend for the Disk ARchiving utility (DAR) that aims to make it easier and quicker to perform common backup tasks using DAR. It uses the GTK+ library, which is installed on most Linux distributions, so usually the only additional dependency is DAR. DarGUI aims to complement and enhance the command line features of DAR rather than conceal them, and to help users to learn how DAR works so that they can use it from the command line when necessary. It is written in Pascal using FreePascal and the Lazarus IDE.
glucopy-glurestore is a set of scripts for copying and restoring a fully functional GNU/Linux (or other Unix-like) system. The glucopy script will back up all system content (system and user files), while the glurestore script will partition and format an identical system, restore the system and user files, and make the system bootable. The scripts are included in the HTML documentation.
(Qt)-Backstep.py is commandline and graphical (Qt) backup software written in pure Python. It can back up any directory to CD-R(W), DVD-R(W), USB key, or another directory. It is a continuous backup solution. It works like a time machine. It contains a backup network server. It can send backups over the Internet or your network.