Ubuntu One was thought to be a multiplatform service. He was even on Linux, even because in this system its cradle, and nothing more sensible than to reach the most used operating system in the world.
So, Canonical can attract more users to the service - if they toparem pay to have some benefits, even better.
One of the settings Ubuntu
Canonical says that Ubuntu One other systems facilitates the sharing of files. In the scenario envisaged by them, a house where one computer runs Linux and other OSes Ubuntu One could use to share documents between different users of the machine. Basically, the same kind of thing that Dropbox does have some time (the SugarSync also, as I remember).
Are you interested in testing Ubuntu One on your computer with Windows? The download is available from that page.
Of course, you must create an account in Ubuntu One to start up your files. Users of free version of the service are entitled to 5 GB to use and abuse the way you prefer. Anyone who wants more than that need to shell out $ 3.99 per month for 20 GB of secure space and also the convenience of the streaming music service provided by Canonical. Granted, the price is not exorbitant, especially for those in need.
If you like the idea of having 20 GB to make your backups but do not want to spend less than $ 10 per month with this, my best suggestion is to appeal to the Microsoft Live SkyDrive. With one difference: it is only up without synchronization of files on different machines.