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BorgBackup

A deduplicating backup program with compression and encryption.

Borg backs up files into a deduplicated, optionally encrypted and compressed repository. It chunks files at content-defined boundaries (using a Buzhash rolling hash), so that small changes between snapshots only consume a small amount of additional storage even across many full snapshots. Encryption is authenticated, with the option of repokey or keyfile-stored secrets.

The Borg Collective forked the project from Attic in 2015 to continue development at a faster pace. Borg has been widely adopted in self-hosting, homelab, and small-business backup setups — the deduplication ratios are usually excellent for typical user data, and the SSH-based remote-repository transport makes "back up to a friend's server or a VPS" easy.

Borg is one of two leading deduplicating backup tools alongside restic. The two have roughly comparable feature sets but differing trade-offs: Borg's repository format is older and more mature, while restic's Go binary is single-file portable and supports a wider range of cloud storage backends out of the box.

Debian/Ubuntu: sudo apt install borgbackup
Fedora/RHEL:   sudo dnf install borgbackup
Arch:          sudo pacman -S borg
macOS:         brew install borgbackup