[protonmail]

Yes, this is indeed what we mean. Proton does not use third-party providers for hosting encrypted user data. So none of the providers that people typically consider to be "cloud" such as AWS. What we do instead is own and operate all of our physical server hardware and network equipment in datacenters in Switzerland and Germany.

[hazmazlaz]

With properly managed encryption, it shouldn't matter to which cloud (yours or theirs) the data goes to.

[indigochill]

Why have just one layer of protection when you can have multiple? https://www.comptia.org/blog/what-is-defense-in-depth

Mistakes happen in the most secure systems. The more layers of defense you have, the less likely a mistake causes an incident.