I’m using end-to-end encrypted sync between devices — I agree it’s very convenient and secure. At the same time, I’d also like to occasionally create and keep a separate local backup, just to have it available in every situation and protect it myself (kind of like an extra layer of resilience).
I’ve done some quick tests already, but it’s still not 100% clear to me. For example, with Proton it’s hard to verify whether the automatic local backups are encrypted or not. As far as I can tell (I’ll double-check), those backups don’t get stored in a normal folder you can inspect, but rather in a hidden app directory — which makes it tricky to check directly.
I plan to run some additional tests and will update with further details once I have more information.