Thank you @Liz
I've since edited my original tutorial to clarify that this tutorial only applies to those customers who, like myself, are using a basic set-up
Birddog, yeah, I know it's the backdrops but they must be hideously large files or Google is doing something else other than downloading backdrops (surprise!). I also read about making and using your own image but that didn't stop the downloading of backgrounds.
Your link just took me to a reply I made in this conversation
So you find you can simply turn the tv off and it disables the Chromecast? A HN tech support agent showed me that my system was using 17MB/hour in the middle of the night when everything was off (including the tv). Just having the tv off didn't stop it. I had to unplug the USB cable from the CC, killing any connection to it. Since my tv is on the wall, over the office desk (Bedroom tv is even higher), it was way too much trouble to unplug it when not in use AND the 17MB/hour it was using on top of casting. Since I'm now scheduling my videos during Bonus hours, I could afford the 3-4MB/hour.
The link you provided creates a reply. I think you meant to post something different. 😋
Oops, so I did, thanks Gabe. I corrected it there and here it is again: https://www.howtogeek.com/337719/how-to-tame-your-chromecasts-background-data-usage/
Guess I need to brush up on my copy/paste technique.
Perhaps @monicakm will want to look at the correct link, sorry about that.