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There are apparently problems with wipe/restore under GrapheneOS:

<https://news.ycombinator.com/item?id=49060780>

(From the HN GrapheneOS account about a month ago.)

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That link says you can't take a image of the disk prior to wiping.

OP is talking about just backing up what you need off-phone and then wiping it.

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What problems are you referring to?
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Yes. Of course it is permissible. It is your device. The wipe must have completed before arriving at the counter.
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I wouldn't assume that to be the case. It's illegal under federal law to destroy evidence of a crime. Just what the government needs to do to show that you've destroyed evidence of a crime and not just the sexting you did with your girlfriend is a pretty murky area of law, from what I can tell.

I would not present a phone to customs that had clearly just been wiped.

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You're speaking nonsense since there was no charge or warrant against him. There was no crime that was committed. People are free to use their phone for f sake. People who reason as poorly as you will lead to all remaining rights being lost.
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Ah, I see where you've gone wrong. You're expecting to apply common sense and reason to the law.

That kind of thinking has landed a whole lot of people in prison.

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