Comment by Steppschuh

Bdrive[1] is end to end encrypted and implemented as RAIC of different cloud storage providers. It's currently a B2B only solution provided by the Bundesdruckerei (German federal printing office).

Disclaimer: I work for a software engineering company related to the Bundesdruckerei.

[1] https://www.bundesdruckerei.de/en/About-us/Innovations/BDriv...