I use cloud storage for a good deal of our small business data. The question is do the people who work at the place my data is stored at do a better job than I would protecting that data? probably. Am I worried about about most of that data being obtained by a hacker? No. 70% of it is actually public record, and the other 30% is really boring financial stuff. Could someone steal my identity if they got this information? Most likely. if this happens, have fun blackhat; the IRS is after you, and so is the (local) state employment security department! (also you may have a bench warrant) have fun.