Recently one of the (two) processors on our server failed. The server is in Los Angeles, Ca. If the second processor were to fail, the site would be offline for days if not weeks while the server is repaired.
In order to avoid that problem, I had to purchase a new (refurbished) server and eight hard drives. Technical stuff but half of the drives mirror the content of the site.
The new server has been delivered and installed. It's currently being updated/copied and the "switch" should be flipped Sunday evening 8/21/2014.
I don't expect any significant service interruption.