Having a local storage of this type is half the problem. The other half is syncing the data between different browsers and keeping it backed up. Imagine if all

Having a local storage of this type is half the problem. The other half is syncing the data between different browsers and keeping it backed up. Imagine if all your mail, years and years of it, lived in IndexDB inside your browser on your one device. I think browsers should implement a standard way to sync local storage, identity information (think private keys instead of passwords), cookies, etc. across all the browsers you use. Oh and obviously it should all be encrypted at rest and you get to choose which service you use to sync the data, so you can avoid the less trusted ones. What kind of utopia would this be?