Let's face it, to think that every MegaUpload user has copyrighted content uploaded on the site is like saying everyone going to work at Capitol Hill is naughty (did we just say that?). Regardless, data uploaded by as many as 50 million users faces deletion this week due to non-payment of MegaUpload's dues to its third-party hosting providers.
This data could be anything from precious legitimate online data backups to the alleged copyrighted content, including data backups by paid subscribers. This, even before the users could have a chance to download their data as the site went offline abruptly on the 19th of this month. Before similar services such as Yahoo! Briefcase went offline (because the company discontinued the service), users were notified, and had a chance to download their data, as it faced deletion. MegaUpload had as many as 150 million registered users.
Source: BBC