I have 'nothing to hide' but free speech is not what Elon thinks it means (in many countries), including now, the US. I don't want to be arrested for something I said 10 years ago which was now mined, or hallucinated, by Palantir AI scanning my phone.
What you should be able to do is wipe it, then pull down the backup image and get it back exactly the way it was.
Which you just...can't do AFAIK.
To do it without flashing you need to be comfortable modifying system software. Which for Android means authoring your own ROM. It's a hassle.
You'd download your image to the card, then reboot and it'd flash it.
Basically we could eliminate the hassle.
You write the data to it, delete the phone app which did that write, and once you are through, re-install the phone app and read your data.
Last time I went through the TSA scatter scanners and wand waving theatre the 3 implants I had were not detected.
I know my bank account PIN, and it's linked through Apple Pay. My other cards - credit x2, building society I have no clue. Those PINs are stored and given I'm never out without my phone I always have access to the numbers.
I was constantly stopped and quizzed by the TSA to the point I would wipe my macbook and phone before travelling. Using the NFC chips that had all the details I needed made sense.
I've heard Russia uses Cellebrite devices at borders, which means cloud-storing an image of your entire device for foreign intelligence agencies to carve up later is possible.