Re: Icloud clone?
Ubuntu One? That is far too new to be original.
If anything we could go straight to iCloud's great grandfather and call this a derivative of Apple's iTools with iDisk, launched in Jan 2000. Quite similar strategy as iCloud, the service came bundled free with Mac OS.
Not sure if there were other similar virtual "cloud" disk services available to the public before it - obviously I mean outside of keeping a shell/web hosting account somewhere and using it as a server.
Do let me know if you know one.