I'm curious about blockchain solutions for this.

Public blockchains have potential to be part of the solution. Imagine the following:

- Decentralized file hosting using IPFS

- Decentralized login using ENS / Ethereum Name Service

- Email service gives you a UI on top of your data, plus an outbound server for relaying to/from non-blockchain email accounts

Overall, you end up with portable data thanks to IPFS, and a login through ENS to whatever UI you want to use/pay for.

This seems like a win to me. Haven't seen anything yet that pulls this together but the pieces are there. Maybe someone here wants to prototype it.