I'm a little ashamed to say that this is the first time the shutting down of a service almost brings me to tears. A couple months ago, burglars entered my house and stoled --among other valuable stuff-- our laptops (wife's and mine) our cameras and with them a lot of pictures from our first year married. While I was able to recover some from iCloud and Dropbox and instagram, my wife was crying hopelessly for the lost…
I'd warn you to not rely on any startup and to make sure your data, if its critical, is dispersed between different services, such as Dropbox, Google Drive, Sky Drive. I've not used it yet, but you can sync files between cloud services via CloudHQ; https://www.cloudhq.net/dropbox