Vault: customer-held key modes
In Your devices only and Two-key vault modes, we cannot see the contents of your files, your passphrase, or your recovery key. Files are encrypted on your device, and we store only ciphertext.
We do see the operational basics: your account email and plan, how much you store, when files change, and which storage backend you connect. If you lose both your passphrase and your recovery key in Your devices only mode, no one can restore your data, including us.