[aborsy]

Sure, but you don’t need to pay a premium for end to end encryption like with proton.

You would encrypt (all or part of) your NAS client side with your software of choice (I use restic) and ship it anywhere off site: could be cheapest cloud, or another location you have access to.

[kykat]

True, I use proton for their mail and VPN, but use hetzner for bulk backups