iBackup simplifies the task of backing up the system configuration files (those under /etc) for UNIX systems (Solaris, *BSD, Linux). You can run the program from any directory and it will by default save the (maybe compressed) tarball to /root. It is possible to encrypt the tarball, to upload the tarball to some other host and run the backup automated in a cronjob.

First you have to copy the configuration file to /etc in debian based systems:
cp /usr/share/doc/ibackup/examples/ibackup.conf /etc

After copying the file, you can backup the system configuration file by typing ibackup linux sysconf.

Or to backup other configuration files, here is alist: http://www.linuks.mine.nu/ibackup/