Smoothback is a script written for the public domain Bourne shell to handle backups.
It requires rsync and a /bin/sh.
The code is developed on an OpenBSD machine, but also tested on NetBSD, MirBSD, and a few Linux distributions.
There is no configuration file as of version 1.2, but arguments are easily explained and organized
in the default .sh files with comments that should make configuration rather easy.

smoothback is meant to be modified (and in fact, in its default configuration will do absolutely nothing)
and does require a moderate understanding of how shells work, as well as rsync arguments (nothing
further than the manpages for either have documented though).

Ideally it would be run from a crontab of a user and executed over ssh using keys.