Any organization, public or private, should be backing up their Google-provided services on their own.
To say that Google Apps, etc is a new and unique threat to it is silly though. At this point between contractors and private infrastructure providers there is little or no government data that is handled only by government employees.
edit: Also, on the federal level one of the big pushes of the new CTO is for GSA to build out its own "cloud" of datacenters with which to host applications and house data for the rest of the executive agencies. While the government might well hire could services from private companies, the goal is to warehouse data inside a government controlled environment.
"The reference to Going Google refers to US state governments using one or more of Google’s enterprise products..."
Let's not forget that Google's enterprise products include their search appliances, Google Earth (to some extent), etc. This isn't by any means saying that upwards of 50 percent of state governments are using Google Docs.
