Maybe you can setup a clone with different passwords and no real data? I don't thing your cautiousness is unreasonable.
In the end, I just reinstalled everything because it just didn't feel right.
I completely understand, but how will they access it? Over something like teamviewer where you can also see the screen and control the mouse keyboard would be preferable to ssh access where you have no idea whats happening until it’s over.
On the other hand, whatever he’s going to do he should hopefully know beforehand, otherwise it just sounds like a fishing session to try a few things.
Without more information it's impossible to say.
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