In general, throwaway devices are recommended for visits to countries like China or USA.
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I sync important things to an encrypted drive, so I can flash and restore with little lost but convenience and a couple of hours of downtime.
They kept a ~~titan key~~ Iron Key of mine when I said I couldn't remember the passcode. Never got it back. 2018, ymmv.
Iron Key
Exactly! But it's easy to flash to something that boots and looks plausible, then sync back all your stuff when you get to your destination
Truecrypt used to do this, hidden drives inside of encrypted drives, impossible to tell if you are looking at the hidden or encrypted.
Wish more phones came like this, even GraphineOS isn't that good at data silos