I'm about to switch my outdated Samsung tablet and smartphones to LineageOS. But I want to make a backup of my device, including the OS and everything, in case something goes wrong and I need to flash the original OS back into the device.

How do I proceed? I think I need to do a Nandroid backup or something? Is that correct?

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It's not really about the data. It's more about the OS. I want to be able to roll back to the original image if Lineage OS fails.

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