RsyncProject / rsync

An open source utility that provides fast incremental file transfer. It also has useful features for backup and restore operations among many other use cases.

pgbackrest / pgbackrest

Reliable PostgreSQL Backup & Restore

libarchive / libarchive

Multi-format archive and compression library

amadvance / snapraid

A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures

uroni / urbackup_backend

UrBackup - Client/Server Open Source Network Backup for Windows, MacOS and Linux

Tarsnap / scrypt

The scrypt key derivation function was originally developed for use in the Tarsnap online backup system and is designed to be far more secure against hardware brute-force attacks than alternative functions such as PBKDF2 or bcrypt.

cursedtoast2 / ChroMagic

Custom firmware for the ModRetro Chromatic, enabling cartridge backups