Replying to Avatar Ava

Using Proton Drive and/or self-hosting for sensitive data—for the somewhat tech-savvy, buying a Synology NAS makes this pretty straightforward (though it's not open-source). There are plenty of tutorials on YouTube and the web that show you how to easily set up a personal or family cloud backup, and their photos app works great for photo backups. This would also allow people to self-host their own NextCloud instance on it.
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Deleted Account 10mo ago

Can you self host all your proton data on a NAS?

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Ava 10mo ago

You can use Proton with your own domain, but the core Proton services are not designed for self-hosting.

While Proton is open source on the client side, their service infrastructure is proprietary and cannot be self-hosted on a NAS or any other personal hardware.

AFAIK, the only self-hosting related options with Proton are using a custom domain with Proton services and utilizing their SMTP bridge for integration with other applications.