I've been using this backup-method for a while now and it works well for me.
After upgrading OSX to Snow Leopard, though, rsync would start to do its thing and then it would get stuck at
for no apparent reason.
After looking around a bit, I read that the version of rsync that OSX brings with it is fairly old and a newer version might behave better. Using this tutorial, I installed/compiled rsync 3.0.7 and it solved the problem.
Some articles on the same topic that are interesting as well: