AudioVisual Preservation Solutions, has released Feet on the Ground: A Practical Approach to the Cloud—Nine Things to Consider When Assessing Cloud Storage.
Here's an excerpt:
There is no all-in-one solution that will fulfill every archives' needs for preservation storage. Often, cloud storage services fulfill a portion of an organization's larger preservation infrastructure, providing secure back up for preservation copies or supporting delivery of access files from low-latency storage. Vetting and selection is therefore the alignment of organizational and collection needs with the offerings and functionality of a service. This means defining your acceptance criteria for optimal functionality and understanding how a service will fit in your preservation environment.