From: https://ente.io/privacy#account-data

> Data security is very important to ente, whether that is your personal information or any other data. That is why we publish our client-side browser and mobile app software and why we have provided information in this Policy on collection and storage of all data whether or not it is personal information.

How does this prove Data security?

> And what is this: our architecture has been reviewed by cryptographers and engineers from IBM Research, ETH Zurich, IIT Delhi, Google, Facebook, Amazon, Microsoft, ...

Any white-paper?