Recommended rsync tutorials?

[Bruce Labitt]

  I'm looking to use rsync on a cron job to do some 
'backup'.  I've read man rsync and a few 'tutorials'.  It 
looks not too hard - this worries me.  :)

Anyone have a good/favorite tutorial on rsync that talks 
about how to do this over ssh and avoids common pitfalls?  
(like unmounted nfs...) lmgtfy, would not be too helpful.  
Done that, checked out a few of them, looking for something 
relatively understandable...

-Bruce