G-Raid 2tb with usb 2.0 and firewire 800 HOW TO SET UP RAID1?

HOW TO SET UP RAID1?
I have this hardware and MacOS High Sierra and I want to setup from 2TB to 1tb raid1.
How?
Whay is so hard to find solulution on g-technology site?
Where is the solution?
Who make thsi website? :))
GIVE ME ANSWERS!!!

That version of the G-RAID does not have the ability to be changed. It is a hardware only RAID0. Only our newest model of the G-RAID Removable series can be changed to RAID1

can I upgrade this old hardware with 4tb or 6tb wd disk? or seagate?
regards
Zinger

You can swap drives in to the enclosure but it might have a problem trying to create a RAID to work with the devices. These older enclosures were never tested with anything other than HGST drives.