rsync PC to Kobo

Hello,

I would like to install rsync my PC folder books (debian 9) with my Kobo folder books.

I have found few interesting threads regarding rsync in the kobo here:
Link 1.
Link 2
Link 3

But I still don't get it how to install it in the Kobo. Do I have to root the kobo? install Linux in it?
Can anybody tell me the general steps in order to install rsync in my kobo please?

Laurent.