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Passkeys might really kill passwords
(www.theverge.com)
This is a most excellent place for technology news and articles.
Can you use SyncThing along with Nextcloud? I currently use Nextcloud to store my data, but the one part where it still lags a bit behind is on Android specifically (you need to manually sync certain changes).
I don't know anything about Nextcloud. Syncthing is open source, and there are a couple of Android apps. I use Syncthing Fork and don't have any problems.