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You're not alone: This email from Google's Gemini team is concerning
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
I just use Syncthing. No cloud, just keeps any folders I choose on any devices synced with one another. Never had a problem, and while the files yes accessible on the internet technically, they're not stored anywhere except the devices that have access to them. Works like a charm.