Local API Access

Hello,

I have a Nabu Casa Home Assistant and I want to have local access to my Somfy products. I have a Tahoma Box from 2015 (I guess), it is a 2018.4.4.7-kizboxv1.
With that box I only have cloud access to my products with Home Assistant (to my understanding). That works well with my Home Assistant but I want local access without internet requirement anyway.
I think I need to upgrade to a Tahoma Switch; is that correct?
How do I switch boxes, is there a standard procdure to transfer my accoung to a new box so I keep all my products (and maybe settings)?

Thanks for help.
Ingolf