Public cloud storage services are attractive to consumers, small businesses and (often in defiance of their own IT departments' guidelines) individuals within enterprises. Most offer a basic storage, synchronisation and sharing service for free, with additional capacity and value-added services available on a monthly or yearly subscription.

Dropbox is the poster child in this market, offering best-in-class usability and, since April 2013, an IT-friendly version called Dropbox for Business. According to the privately-held San Francisco-based company, it has more than 300 million users, saves 1 billion files a day, supports 19 languages with ...

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