How to set up load balancing/failover for a Joomla site?

Hello,
I currently manage a Joomla website for a client who owns her own server. She is very averse to any downtime whatsoever and wants to set up a failover setup by using a separate hosting account on a different server somewhere else in the country. The primary site is roughly 1gig in size and has users logging in to accomplish tasks throughout the day.

I am not comfortable taking this task on on my own and need some suggestions of who to talk to to set such a thing up. If it was...

How to set up load balancing/failover for a Joomla site?

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