Maybe it was already asked from someone else, but I am sorry, couldn't find it...

We are running 2x Zimbra 7 server and would like to get it synced periodic, in case the primary server die.
Is there any script, or other solution, we can use to sync it?
It would be good enough, if only all domains and mail accounts would be generated on backup server,
that all user are still able to receive and send mails, till the primary server is back alive.

Thanks for any hint!!