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Re:Conduit: Simple, fast and reliable chat server powered by... by therein on Sunday July 30, 2023 @11:42PM (#36938590)
XMPP supports delayed delivery. It works although I have had minor issues with it, especially if OMEMO is enabled.

https://xmpp.org/extensions/xep-0203.html

Re:Conduit: Simple, fast and reliable chat server powered by... by nicoco on Monday July 31, 2023 @06:13PM (#36949599)
I think it's mostly through server side archives that chat history is kept in sync between devices nowadays

https://xmpp.org/extensions/xep-0313.html