Rsync Users and Groups

Hello everybody!

I'm trying to configure rsync-server, but still I can't figure out how to
manage users and groups.

I read in the documentation that I could use both, but there is nothing
about how to add a user into a particular group...

Why am I doing this?
1. I have about 10 modules, which are different and must be available for
some users and not available for other users.
2. There are many users, new users are arriving, some old users are going
out, so it would be easier to assign group permissions to the modules and
then manage just user-group relations, but I couldn't find that in
documentation, nor examples on the internet...

Could anybody please give me a hint or a clue about how to assign a user to
a particular group? I'm sure that this should work, but I can't find it out
myself :(

Thank you very much.

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