I've already been playing around with User>Library>Mobile Documents and concluded that it functions exactly like the local Dropbox folder on my Mac, so that anything in it gets uploaded to iCloud and becomes accessible to any other Mac signed in to the same iCloud account. It's possible for a user to use that folder directly, but iClouDrive makes it a lot easier for people who don't want to go digging around in Library stuff. I keep my most critical files in one folder on my Mac and can set ChronoSynch to do scheduled backups to the copy of this folder in my iClouDrive folder, so I'm pretty much home free. The only better thing would be if somebody would cook up a utility similar to MacDropAny for Dropbox which would create symbolic links to the iClouDrive folder, so that any changes I make in my critical folder would get uploaded to iCloud on the fly. You must realize, however, that the critical limitation of this whole business is that it only works on Macs, there's no way to access this Apple-unauthorized data on a mobile device. Nevertheless, it's a great way to share data between Macs and also to do off-site backups, never a bad idea. In fact, redundancy fans can now use iCloud and Dropbox for duplicate offsite backups.