I would build another server and use DRBD (https://www.drbd.org) to keep everything in sync. DRBD is essentially raid 1 over a network connection so you can use it for a warm stand-by server or for syncing data off site.
From: "Khurram Shahzad" <address@hidden>
To: "health" <address@hidden>
Sent: Thursday, July 14, 2016 9:39:24 AM
Subject: [Health] High Availability of GNU Health
Dear All,
How can we have highly available GNU Health installation?
I mean, if we have installed GNU Health on one machine along with database, it is possible that due to any failure at hardware or software level, the server goes down. How can we make our GNU Health services available from another server having the same config and data and also get our Tryton client connected to this new server?