It’s only hard when you’re trying to use it for what it wasn’t designed to do. I hope in 10 years, you still have devices that will satisfy your tin foil needs. I don’t see the cloud services back tracking. In the future, I can see EVERYTHING will be online somewhere. You’re just fighting the inevitable.
In the future, assuming that the Internet and ipv6 become ubiquitous enough, there will actually be less need for centralized servers of ANY type. Cloud or local.
iPad turns on. iPad pings iPhone and Macbook. “Any changed files for me today?” Storage on devices is cheap. Bandwidth is also getting cheaper. If the data are available and stored on several devices, this would also reduce the need for backup.