David S. H. Rosenthal and Daniel L. Vargas have self-archived "LOCKSS Boxes in the Cloud" at the LOCKSS website.
Here's an excerpt:
The 30-year history of raw disk costs shows a drop of at least 30% per year. The history of cloud storage costs from commercial providers shows that they drop at most 3% per year. Until there is a radical change in one or other of these cost curves it clear that cloud storage is not even close to cost-competitive with local disk storage for long-term preservation purposes in general, and LOCKSS boxes in particular.