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Signal is an instant messenger ... which is fine, but sometimes you really do need the extra security provided by an offline messaging solution like OpenPGP. The Cellebrite thing was a good example of this. Cellebrite doesn't get OpenPGP messages as they can and are usually protected by a passphrase. Cellebrite gets Signal messages.

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In that case I would recommend Age. It’s a modern and sound replacement for GPG.

https://age-encryption.org/

Not really. My opinion in some detail:

* https://articles.59.ca/doku.php?id=pgpfan:agevspgp

Age might be such a replacement some day for just the encryption function. But it has a ways to go. Actually defining the format would be a good first step.

For encrypted backups, I believe that Restic is a better tool https://restic.net/

Enabling 'disappearing messages' will help I think.

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