Cloud office suites store documents.... in the cloud
By default, but you're free to save your documents to your hard drive in what ever format is convenient for you just treating them like a normal word processor.
Slightly more hassle of course compared to save/edit anywhere, but I guess that's the price you pay to stave off paranoia.
"It says he made us all to be just like him. So if we're dumb, then god is dumb, and maybe even a little ugly on the side." -- Frank Zappa