A new report finds federal agencies can wring a lot more potential savings by implementing cloud computing. The study by the group Meritalk finds agencies are saving about 5 billiion dollars a year right now…but total potential savings could be as much as 12 billion dollars. A survey of more than 100 government IT managers found percieved security concerns are the biggest factor holding back cloud adoption. 85 percent of those surveyed cited security worries. The second biggest factor: agency culture, at 38 percent.