The LOCKSS Program at Stanford Libraries provides open-source technologies and services for high-confidence, resilient, secure digital preservation.
Found on David Rosenthal's blog https://blog.dshr.org/2024/01/a-lesson-learned.htm

A backup utility based on rsync with the approach popularized by the Time Machine of Apple. Found on the Wikipedia entry for rsync https://en.wikipedia.org/wiki/Rsync
See also the following links for rsync-based backup tools
https://rsnapshot.org/ written in Perl.
http://www.lbackup.org/

Blog article describing an rsync-based backup system, with reasons why it was chosen over restic.

Filestash (formerly nuage) is a web client for org-mode. It started as its author believe emacs and org-mode are the greatest thing since sliced bread. The project aims to fix the pain points org-mode's users may have:
- emacs isn't great out of the desktop world, it needs a cross platform companion app
- not everyone is willing to go through learning emacs which makes org-mode a hard to sell tool to manage team project.

A positive review can be found on https://nixfaq.org/2020/06/filestash-a-drag-and-drop-gui-for-file-management-on-server.html

See https://www.filestash.app/2021/09/06/android-backup/ for a neat way to backup photos from an Android phone.

From the author:
"I was looking for a simple way to backup data on Android devices directly to a device running GNU/Linux connected over a USB cable (in my case, a desktop computer).

Is this really so unique that it’s worth writing a new article about it? Well, in my case, I did not want to buffer the data on any “intermediate” devices such as storage cards connected via microSD or USB-OTG. Also, I did not want to use any proprietary tools or formats. Instead, I wanted to store my backups in “oldschool” formats such as dd-images or tar archives. I did not find a comprehensive howto for that, so I decided to write this article."

diff-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.

Version 1.2.8, released March 16th 2009
Includes a windows version.

Backup/restore to/from remote storage. Data is encrypted locally and de-duplicated to minimize the amount of data transferred.