I hope this is the right Forum!

I have a CentOS 6.2 Webserver with several name-based Virtual sites. I cloned an exact copy of the server to a different VMware ESX host and gave it a different IP address, so if by any chance there is a problem with the webserver on say Host A, all I need to do is change the IP Address on Host B and restart and I should be able to get back online in minutes.

Now, because the content of the webservers and Forums change quite frequently, I need to keep Host B in sync with Host A.

From my bit of research, RSYNC seems to be the way forward. It looks fairly simple, BUT...

Like everything else there is always a bit missing.

1. Which machine should I set up as the RSync Server, Host A (the live site) or Host B (the backup site)?
2. Can I sync /var/www/* to /var/www/* on the Backup?
3. I guess I should do this over SSH?
4. I also guess I can setup a Cron job to sync the servers every night?

Am I on the right track here? Is there something I'm missing?

Yeah, sounds like you've got the hang of it. There's no client / server in rsync really, just the two locations to compare. You can get the same result wherever you run it from with reversed commands. Running it over SSH makes it even simpler, as there is no remote daemon to run at all, you'd just add "-e ssh" to the command. http://troy.jdmz.net/rsync/index.html

rsync is a perfectly good solution, but you might prefer something like subversion. It can seem like overkill, and does take a little setting up, but it makes for a really nice solution including version control, so you'll not lose any files going forwards if you delete and rsync by mistake.