I’ve worked somewhere that used Snapback, and that’s also from Mike Rubel’s writings.

https://metacpan.org/dist/Snapback2/view/scripts/snapback2.P...

The 2 is I think because an earlier incarnation was by Art Mulder. There is also a Python implementation by apparently yet another person, which appears to be independently inspired by Mike Rubel’s writings.

https://github.com/diegocortassa/snapback

There are also rsyncbackup, rsyncmachine, https://rsnapshot.org/, https://github.com/jonaslu/rsyncrotatingbackup (inspired by http://www.dbourget.com/software/remote-backup.pl), and several more with seemingly the same original inspiration.