There's no need for web apps to store all of your data in the cloud, but almost all of them in the real world do it anyway. Users have been conditioned to expec

There's no need for web apps to store all of your data in the cloud, but almost all of them in the real world do it anyway. Users have been conditioned to expect that if they log into the same web app from two different devices that their data will still be there, and this can be a huge convenience, but it's also less private and less secure than what we had with desktop apps.