PS4 How to make a backup to HDD after a version update via NoBD ?

S90

Forum Noob
Hello friends .
So I did the version update to version 9.00.
With the help of the NoBD guide because my Blu-ray disc is not working.
They told me that I must make a backup to the HDD.
I saw in the NoBD guide about the HDD, but I saw that it says on a new HDD and mine is not new.
But it is empty, there is nothing in it.
His guide is too complicated and I am not sure what to do.
I would like to understand what I need to do next.
how i do a hdd backup ?
How do I make this backup?
What is the best and easiest way to do it?
 
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