Out of curiosity.
What happens if you “copy” everything from the old node to the new.
But keep old node as is, I wouldn’t risk turning bot of them online at the same time. Maybe the lightning network explodes.
But how I see it, it’s almost risk free.
Turn off node, copy everything needed, recover LN on new node, if it works, perfect. If it does t you have your old node and you can try again.
Isn’t this how it works?