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Cloud storage services are very secure to use in BYOD environment. Over the air services offered by MDM solutions help the employees to safely access the corporate data. DropBox and cloud based services like MDM solutions are thus the best choices that are totally safe and easy to manage.
Easy. I don't allow it. Services such as Dropbox make it very simple for employees to install sync client software, save files in Dropbox and access the file from various devices, including smartphones and tablets. The problem, should you care about data loss AT ALL, is that a third party now has a copy of your data. If you are wondering about why I yelled "at all", think back to June, when Dropbox had a issue that allowed access to files WITHOUT PASSWORDS (sorry to yell again, but it is an important point). Just prior to that issue, there was an FTC complaint about data security at Dropbox ( http://www.wired.com/threatlevel/2011/05/dropbox-ftc/ ).
I'm only using Dropbox as an example because it was mentioned in the original post. The same concerns exists for me no matter who is the provider. The only truly safe option is to block cloud storage services if you are concerned about data loss. This may not be necessary with all companies, because let's face it, not all data is created equal. You will have to weigh the benefit/risk to determine what is right for your specific business.