Backup internet connection

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Backup internet connection

I have 2 x draytek vigor2800g routers connected to different ISPs.

I am trying to get both routers to forward port 3389(RDP) to one server.

I cannot get them to both work at the same time. If i set the servers gateway to be ip of router1 then router1 can forward port 3389 but router2 cannot. If i set the gateway to be the ip of router2 then it can forward port 3389 but router 1 cannot.

I believe I need to configure a static route but am not sure how, can anyone help please?