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Box is free... The 50 gb is a limited time offer to increase the base amount of space that is usually offered free (5 or 10 gb depending on when you signed up). It can be used for any type of file not just ebooks. Although I much prefer Dropbox's functionality, 50 gb is too good an offer to pass up. You never know if you'll need to sync or share in the future, so best to take the offer while you can!
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