1• SVCHOST.EXE

This is the major data gulper in windows 10 zapping about 1gb in 30 mins. It is a Windows process responsible for all updates including Windows, Windows defender and other Microsoft products.

To turn it off, Go to Control Panel - Administrative Tools - Services - search for BITS and Stop the service by right clicking on it then click on stop.

Or alternatively you can use command prompt which is easier. Right-click on windows icon and select "command prompt (admin)" then copy and paste this command
net stop BITS then press enter.
Whenever you want to update windows again, you will need to enable it again with
net start BITS

2• SET YOUR CONNECTION AS METERED

This will let Windows 10 know you don’t want large updates and apps automatically download.

Go to Start > Settings >Network & Internet > Wi-Fi > Advanced Options.
Then Toggle on Set as metered connection
P.S: Locating this setting might differ on your PC depending on your windows 10 Build version

3• TURN LIVE TILES OFF

Those live tiles on your Start menu use a bit of data too–although not much. You won’t save much data by disabling live tiles, but you can do it if you want to save every little bit.

To prevent a tile from automatically downloading and displaying new data, right-click on the tile in the
Start menu , point to “ More ,” and select “ Turn Live Tile Off .”

Read remaining steps here http://www.gurusmat.ga/2017/10/how-save-data-on-window-10.html?m=1