Why would you like to sync them? The cloud storage saves your files online, thus you don't need to use space on your own disk.
SharePoint libraries are locations on a SharePoint site where you can store and manage the files that you share with team members. After you add files to the library, other people can read and edit them, depending on their permissions. SkyDrive, the free online storage service from Windows Live, enables you to access documents from almost anywhere, and to share them easily with anyone you grant permission to.
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