If you have an idea, the feature request @JonMikelV pointed to earlier would be a good place to discuss. Someone there already uses a Windows event to start the backup when a drive is plugged in, however the perfect solution would be cross-platform, and some web search makes me think this might be OS-specific… Windows methods might use WMI. Linux/mono can’t do WMI, but they might have udev, dbus, and systemd.
Even if nobody can get together enough desire/energy/skill to lay code, a forum How-To is always possible.
It’s a fine idea, but there are lots of ideas in the queue waiting for resources fully consumed on other things. New features often get developed because someone with motivation and skill steps up and gets thing going. That usually causes much excitement, discussion, and suggestions for the person who volunteered to work.