bup!

BorgBackup (short: Borg) is a deduplicating backup program. Optionally, it supports compression and authenticated encryption.

Duplicity is a software suite that provides encrypted, digitally signed, versioned, remote backup of files requiring little of the remote server.

rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago. The idea is to combine the best features of a mirror and an incremental backup. rdiff-backup also preserves subdirectories, hard links, dev files, permissions, uid/gid ownership, modification times, extended attributes, acls, and resource forks. Also, rdiff-backup can operate in a bandwidth efficient manner over a pipe, like rsync. Thus you can use rdiff-backup and ssh to securely back a hard drive up to a remote location, and only the differences will be transmitted. Finally, rdiff-backup is easy to use and settings have sensical defaults. »

Burp is a network backup and restore program. It uses librsync in order to save network traffic and to save on the amount of space that is used by each backup. It also uses VSS (Volume Shadow Copy Service) to make snapshots when backing up Windows computers.

Main features

Snebu -- Simple Network Backup UtilityAn easy to set up and use snapshot-style backup system for Linux. Each backup is a full snapshot of your system, classified with a retention schedule (such as daily, weekly, monthly, etc). Individual backups can be manually expired, or expired based on age / retention schedule. Backups are collected using `find` and `tar` commands, the meta data is extracted into a data catalog (using SQLite), and the file contents are stored deduplicated and compressed in a `lzop` compatible file format. »