Does Ubuntu One's "sync locally" checkbox, visible on the Folders tab, actually relate to syncing on the client computer without internet access, that is, from one disk location on the client computer to another disk location on the same computer?
marked as duplicate by Marco Ceppi♦ Jun 11 '12 at 13:52
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No, it means syncing with the Stored Files In Ubuntu One Cloud storage which requires an Internet connection. I suggest you to visit this url for further explanation.
Further edit , try going through this