If you’re a regular internet user the Personal Data Storage paradigm won’t move your data from the cloud to your personal computer. Most people will still rely on an institutional cloud service, but instead of data-banking with a shareholder-controlled corporation people’s data can be entrusted to the equivalent of member-owned credit unions for data storage.
I don’t know if it was overhyped or too expensive (or both) but Drobo seemed like a good consumer solution to this problem. The idea of being able to live swap drives and have it all handle redundancy, provisioning, recovery, and whatnot automatically is critical for making this a true “home appliance”.
I think Drobo suffered from the problem of being slightly too technical for the technology dumb, and slightly too dumbed down for anybody who knows what Network Attached Storage is. Once you have the knowledge to know that you want network attached storage with redundant hardware, a generic RAID solution is within your ability level and there’s no point paying a giant premium for the Drobo branded version.
There’s a corp solution called “CyberArk” that’s intended for storing passwords and other secrets and providing an audit trail for every access, as well as access controls, etc. It’s nothing like a solution for personal data storage, but those core concepts would be great.
The trick is getting Meta, Alphabet, X, banks, retailers, libraries and the rest to agree to use this API for storage of your data. The next (impossible) trick is enforcing their secure deletion of copies of your data in a timely fashion after they have accessed it.