OpenVPN | TrueNAS | Share BackUP |Config

[MagnumPL]

I have a TrueNas scale. I have several machines set up there plus Backup and a configured openvpn client.
I also have a server where I have an openvpn server.

Question!

How do I have to configure openvpn on the server or on truenas (client) so that anyone who connects to openvpn will be able to access bacupa or pool