This some nsite magic?
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No, I don't think the Nostr premises lead to any good solutions for drives, nor for key rotation.
Sth like Mlkut names + cryptree 
= worth considering
GitHub
Peergos/papers/wuala-cryptree.pdf at master · Peergos/Peergos
A p2p, secure file storage, social network and application protocol - Peergos/Peergos
ah, goode ole wuala, ancient memories....