Available at http://www.bluehelp.de/tutorial/svn-debian-plesk.html there is a good (German) description on how to set up a Subversion repository on a Debian system if also Parallels Plesk Panel is installed. However, there is one thing that needs improvement there: When generating the HTTP password file it is being generated with unix rights which can pose a security thread to your system. This post describes how to fix that.
Surprisingly well Subversion servers can be used also for implementing incremental backup strategies. As it incorporates a good difference handling algorithm and provides magnificant support on investigating versions, it automatically provides features which are ahead of any standard backup program. This post explains how I got to that view and describes the scenario in which it is in productive use.