(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.
Antida is data synchronization and backup software that works on any network that has Internet access. It allows automated backup to USB or any storage device. It can send files to any Web-enabled phone. Only a browser and Internet connection are required, with Antida on the other side of the data transfer. It can communicate with devices behind routers and firewalls on WANs.
Arctor is an easy-to-use and powerful file backup solution, offering fast, reliable backup and version management. It can quickly and easily restore your files in the event of accidental loss or hardware failures. With Arctor, you are able to set up regular, on-the-fly, unattended, automatic backups.
Areca is a file backup system that supports data compression (zip / zip64 format) and encryption, incremental backups, FTP/SFTP file transfer, delta storage mode, and many other features. It includes a transaction mechanism, which guarantees the integrity of your backups. Two user interfaces are available: a command-line interface (useful for backup automation) and a graphical user interface (useful for backup administration).
Arkeia Free Version is a no-cost version of Arkeia Network Backup specifically for small networks. It allows an administrator to backup and restore files via a Web UI. This edition has the option to backup up to two machines to a 250 GB disk storage or tape drive. It allows you to backup Linux machines, Windows desktops, Mac desktops, FreeBSD servers, and more.
Arkeia Network Backup Enterprise Edition for Ubuntu LTS is a completely free version of the Arkeia Network Backup software specifically for Ubuntu servers. It is available in the Ubuntu LTS (Long-Term Support) software repository. It allows an administrator to backup and restore files via a Web UI. This edition has the option to backup up to 2 machines to a 250 GB VTL or tape drive. It allows you to backup Linux machines, Windows desktops, Mac desktops, FreeBSD servers, and more.
BAR is backup archiver program to create compressed and encrypted archives of files that can be stored on a hard disk, CD, DVD, BD, or directly on a server via FTP, SCP, or SFTP. A server mode and a scheduler are integrated for making automated backups in the background. A graphical front end that can connect to the (remote) server is included.
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.