What information is stored in the cloud?

I recently was asked if customer information was stored in the CN Maestro Cloud.  This question came from a Wireless Internet Service Provider, and was asked in the context of wanting to know if it somehow exposed his internet customers in a way that for example a credit card breach might.  I felt it best to get this question out where everyone could hear it - and the expert's answer.

Credit card isn't really a concern - you don't put your cc info in the ePMP device, so how could it possibly know?