Incredibly shallow and dangerously bad hot take. I think you have a very poor understanding of what "security" is, nor the concept of backups in general which necessarily (like security) have a very strong human factors requirement. A backup which is too much of a PITA and requires nearly any level of manual effort simply isn't going to get used much or maintained well at all by the vast majority of the population. Tools and systems exist to serve humanity, not the other way around, and when a system fails badly for many it's not humanity that must all change, it's a shitty system.

Fact: if these people had been running to a decent cloud service, they'd probably still have their data. Really "don't connect backup to the internet" is like, fractally stupid. The more one digs the more stupid angles turn up recursively similar to higher level stupid. "Don't connect backup to the internet" means what to you? What about the computer itself making the backup? If that is connected it could get infected as well, now what? Everyone is just supposed to give up on all networks entirely because "hurr durr nothing on a network is secure"? Which is wrong anyway since security an economic equation, not some ethereal absolute. I hope you never give this advice to anyone IRL.