Encryption is designed to make data difficult to access, so it makes sense to consider backups and encryption jointly. I don’t understand why someone would consider this controversial.
Or maybe just capitulate and admit that a bunch of kids, people and cat pictures maybe don't need to sit on encrypted storage
You seem to be arguing against something here, but it sounds like it’s really just a miscommunication. The original prompt was to fit the instructions on a postcard, and and perhaps it’s not really possible to fit good instructions on a postcard.
In order to fit instructions on a postcard, there are a number of things I left out with the idea that someone could figure them out. Stuff like “how do I do backups” or “should I encrypt my backups”. I thought that people could figure out to encrypt their backups if they wanted to, because backup solutions have that option. I also thought that people could figure out that you’d also encrypt your backups if you encrypted your hard drive. Maybe I should have spelled it out in excruciating detail.
As far as I can tell, that’s the lesson here—spell things out in excruciating detail, or you’ll get sarcastic jabs in the replies.