[[!img delete-data.png link="no" alt="Persistent Storage settings with message: Persistent Folder. The data of this featureis still saved. Delete Data?"]]
Learn more about the maths in [The Intercept: Passphrases That You Can Memorize — But That Even the NSA Can’t Guess](https://theintercept.com/2015/03/26/passphrases-can-memorize-attackers-cant-guess/).
[[!img failure-to-activate.png link="no" alt="Welcome Screen with error message: Failed to activate some features of the Persistent Storage: Persistent Folder."]]