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Hi Luca,

> Now the question: if I decide to copy the whole / and use it, is it
> possible? With 8GB available, I don't have to check every single
> bit...
yes, that would be "pivot root".

However, I wouldn't do that. I think "pivot overlay" is the easiest
option, you just have to copy the content of /overlay to your USB
thumb drive.
> tar -C /overlay -cvf - . | tar -C /mnt/sda1 -xf -
(Given that you mounted the thumb drive on /mnt/sda1)

Afterwards, adjust the UCI configuration in /etc/config/fstab.

Regards,
Jannis
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