I am wondering whether to move all my documents on my MacBook into my iCloud Drive. My iCloud Drive would then become my main and only document folder for files of all types, including photographs, music etc. Where are the documents I create and save into my Mac's iCloud Drive? Are they on my Mac's hard drive and backed up to iCloud? Or are they only in the cloud? Will I be able to access all documents off-line, incuding those I've created or edited in iCloud Drive using my iPad? Assuming I've synced everything before going off-line of course.