Earlier quoted context omitted.
my encrypted chats saved across multiple devices
You get that on Signal. I’ve got it on my phone, laptop, and tablet and I see the chats on all of them. Do you mean message history when setting up a new device? They are working on that, but it’s not so easy to do without storing all your chats with a server side encryption key. Apparently something coming soon though.
https://support.signal.org/hc/en-us/articles/360007062012-Ne...