I'm managing the device using Omada Cloud. How can I backup the config?

I've checked on TP-Link's online emulator/demo 4.3 and it's a simple matter of clicking Settings, Maintenance, Backup & Restore. However, on version 4.4, the Backup & Restore section is missing from Maintenance.

I've got the following IP ranges set up on a 3rd party router and on the controller Interface LAN

Router

192.168.0.1 (DHCP)  VLAN ID 1

10.0.51.1 (DHCP) VLAN ID 20

Controller Interface LAN

192.168.1.1 (DHCP)  VLAN ID 1

Is that the correct way to do it or should DHCP be switched off on the controller and set it to use one of the router's IP ranges? Or should I leave it as it is? If so, should I change the Controller Interface LAN to a different VLAN ID?

Thanks