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 think the best idea would be to duplicate it multiple times and share it with multiple people encrypted so that only you can open it.
Things like IPFS, for example.
This is also the way nostr works.