Earlier quoted context omitted.
Servers on premise with regular backups stored in the cloud can still be cheaper than offloading all your compute, storage and backup to AWS.
The problem is not having the backups, it's restoring them. How do you restore backups when you have no servers to restore them on because they all burnt down?
I don’t understand why you’re artificially constraining this? When we had colo’d servers, we still used cloud services where it made sense (especially S3, scaling storage sucks). I don’t think people are arguing for never using anything but your own equipment.