Ubuntu one Helps store, sync and share information in a Canonical cloud. Comes in free and commercial subscription.
ubuntuone-kde is only supported on Kubuntu 10.10 (which is currently in development and will be released in october). Furthermore please
make sure that your system is completely up-to-date before trying to run Ubuntu One, most recently there were changes to underlying components that are
essential to properly use Ubuntu One.
Install ubuntu one alpha1 in kubuntu 10.10
Open the terminal and run the following commands
sudo add-apt-repository ppa:apachelogger/ubuntuone-kde
sudo apt-get update
sudo apt-get install ubuntuone-kde
Check more details from here