it's intended to be ubuntu with dropbox added. the key advantage is that you don't need to install ubuntu on the machine, so if you can reboot the system you are using, you can just boot any system off of your USB key and have all your data. by storing the data 'in the cloud' it means that if you loose the UDB key you don't loose you data.
yes, it would be nice if additional cloud storage devices were supported, but it's probably better to have the maintainer work on bigger issues (the encryption problem, making sure all your bookmarks, etc get synced to the cloud, etc) before worrying too much about the limited cloud storage support.
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