Settings
Storage
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Plan
This browser
The web client does not keep a local copy of your files: everything is fetched and decrypted when you open it. The Android app does keep a cache, which is what makes it work with no signal.
Everything in La Nube is encrypted in this browser before it is sent. The
server stores ciphertext and the lengths of it: not your files, not their
names, and not the folders you put them in.