Tailscale is blocking my backup app

I just started using Tailscale, AWESOME!
I have it setup on a “gateway” machine, that allows access to my LAN so I may access a NAS, printer, etc.
I believe I have it setup correctly, because well… It works, AWESOME!
My problem is on that same machine, its Windows 10, my backup app says it can not access the backup server. This app is Idrive, from Idrive.com. If I disconnect Tailscale, it connects and works.
How do I tell Tailscale to leave this backup app alone and not route traffic it sends?