rsync 2 million files

[Martin Strand]

I'm trying to use rsync to get a live backup of 2 million files, about 50  
gb, max depth of 5 directory levels.
I'm on a gigabit lan so I'm passing -W, but it's still incredibly slow.  
What else can I do to speed things up?
Perhaps there's a good way to filter out files older than X so only newer  
files are checked?.
Will rsync 3.0.0 make a big difference for large trees?
Thanks for any tips,
Martin
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