Rsync

I use rsync to keep redundant servers in sync. I only sync the user data and keep the configs up by hand.

Adding Rsync

make sure rsync server is set up on active machine - copy configs from existing setup and edit
get rsync-client.tgz
put rsync.pl and rsync.pl.conf into /root
set up rsync.pl.conf
you need a user on both machines who can accept the ssh connection, be careful not to blow this user away during rsync
do lots of fiddling to get ssh to work (didn't have to with machines I'm working on while I'm making these notes, so not much help from me today...)
it should work