What is the technology for RDP backup, etc.?

Question

RDP

Good afternoon. I will try to explain on the fingers.
There is a Mikrotik with 2 channels, behind the Mikrotik are client servers, to which they connect via RDP. Accordingly, clients have access to only 1 IP address to their server. It turns out that the 2nd channel is not involved at all. And sometimes it happens that this provider breaks down. It turns out that you either need to make 2 icons for clients with different IP addresses, which is also very inconvenient. There is also a server that is idle in the data center. I drew a small diagram as I see it, but I can not understand what can be used for this.