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Passkeys might really kill passwords
(www.theverge.com)
This is a most excellent place for technology news and articles.
this is the way
you can even tweak folders to either send or receive only on some devices
plus if you really want to be safe you can set file versioning and ignore deletes on a folder to make it strictly backup on more than one device
no internet connection required, you can set it all on lan
I think it is my favorite open-source project after Torvalds' creations