The challenges of storage technology are often underestimated. As Gilda Radner used to say, "there's always somethin." Of course, when that certain somthin' happens with storage, it makes people squirm.
Projections for the widespread success of cloud storage tend to discount the unexpected things that seem to be inevitable. The latest cloud storage outage hit HP's new service this week. I suspect that HP took a pretty hard look at a wide range of failures and attacks before launching, but it's impossible to out think Murphy.