Bareos is a cross-network Open Source backup solution (licensed under AGPLv3) which preserves, archives, and recovers data from all major operating systems.

DAR - Disk ARchive

Local file sync & backups

Huge f*cking file delta copy

Windows volume shadow copy service command line tool

Back up your files on ordinary paper in the form of oversized bitmaps

Custom synchronization manager for personal use that helps you synchronize your files and folders across different locations.

Cloudundancy is a C++ command line program for quickly creating cloud-redundant and device-redundant backups of files.

An ultra-simple and lightweight command-line based backup tool.

This utility helps making backup copies when the backup drive is not enough for whole copy.

A utility for backing up a larger storage medium to multiple smaller ones

Antarctica is an user data in-cloud backup tool for Linux distros

LibreOffice backup PACK unpacker

Backs up files that have been modified that same day.

modified version of adb for https://github.com/kwyntes/adbackup (the commit history is fucked because i don't know how to use git and aosp uses some weird multi-repo management tool and i couldn't push the repo it had created for some reason)