To exclude or include... That is the question.

[Peter Cormick]

I'm trying to use rsync to backup user home directories.  They all live
in /home, but so does some other rubbish which I do not want.
The user ids all start with u, so I tried something like this:
exclude = *
include = u*
But this will only allow processing of file and directories that start
with u.  What I want is for everything below the ublahblah directory to
be copied.  How to achieve this... simply?

Many thanks to those that help.