You just go to "your monitors" on the website and the graph appears. It pings your machine 24/7 but uses negligible bandwidth.
e.g.
To post it here, click "generate graph" and then "small graph". To make it a snapshot and not a realtime graph copy and paste all after ' src=" ' up to ' " /></a> '
It will look like [url]http://www.thinkbroadband.com/ping/share-thumb/e389e84fe786e310a9e08ed5717793dc-11-10-2016.png