How to stop huge consumption of internet data by Ubuntu 20.04?

For the past 5 years, I have been using Ubuntu 14.04 LTS. During that time, I didn’t face any unwanted internet data consumption issues. Recently I installed Ubuntu 20.04 LTS. I haven't installed any other software yet. I configured auto update settings as below. Ubuntu 20.04 software & update settings

Even after the above settings, Ubuntu 20.04 consumes around 1 GB of internet data within a few minutes in idle state (not browsing anything). I am using Wi-Fi hotspots internet data from mobile. Please help guide me to stop this huge unintended consumption of internet data by Ubuntu 20.04. Thanks.

You have to find out which process use your bandwidth, you should install and use nethogs to check how much which process use:

sudo apt-get install nethogs

https://manpages.ubuntu.com/manpages/trusty/man8/nethogs.8.html