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That page, is also an article from 2017 :-)

I, too, from some other comments in this thread, just found out that chat history transfer has been a feature since June 2020: https://www.theverge.com/2020/6/9/21280664/signal-chat-trans...

That's an iOS specific new feature. Signal has had backups for a long time now.

The backup feature is not new.

The article is from 2017 and Signal added backups in 2018.

My Signal message history goes back further than that but maybe the feature was added midway before I switched phones.