Replicate FreeBSD server

[Jason Lieurance]

Hello,

I know this has been asked before but I can't find the answer I'm looking for.
Anyway, we have a FreeBSD 4.7 email (qmail, courier imap) and web (php, Mysql)
server. I want to have a failover server offsite so if the master goes down the
backup will kick in. The backup server needs to have an up-to-date(real-time) copy
of the email(courier-imap), Mysql, and web information. Will rsync do all this as
far the the replication goes? I hope there is open source software for this if not.
I know about clustering products and so forth but I'd like to do this as cheap as
possible.

Thanks.

-- 
Jason