There is a company that delivers broadcast video ads to hundreds of TV stations on demand. The ad has to run and run now, so they cannot tolerate failure. They

There is a company that delivers broadcast video ads to hundreds of TV stations on demand. The ad has to run and run now, so they cannot tolerate failure. They write the videos to GCS storage in Google Cloud, and to S3 in AWS. Every point of their workflows are checkpointed and cross referenced across GCP and AWS. If either side drops the ball, the other picks it up. So yes, you can design a super fault tolerant system. This company did it because failing to deliver a few ads would mean lose of major contracts.