How to control traffic in the presence of satellite and mobile Internet?

Question

Mobile Internet

I have mobile internet. I want to connect additional satellite.
First, I would like to track the limit from each Internet. That is, I get 2 types of connection, how and with the help of which program you can receive and store statistics on how much per day, month it took and traffic was received.
Secondly, I want to connect satellite as a backup. Mobile turned off, satellite turns on automatically. The mobile is turned on, the satellite is turned off.
How to implement it?

Answer 1

This is called channel reservation, I advise you to ask Google Yandex and read this link along with comments.