When I was working as contractor for one of big banks, which dev was concentrated on Canary Wharf, they weren't able to successfully complete disaster recovery

When I was working as contractor for one of big banks, which dev was concentrated on Canary Wharf, they weren't able to successfully complete disaster recovery testing on their primary database cluster for 2 years in a row, I just don't remember, was is department-wide or bank-wide. Basically, each 6 months DR testing was failing and it was accepted as harsh reality. After seeing how they're working inside, I don't think that moving their infrastructure to AWS/Azure/Google is worst that could happen. disc: Currently working at Amazon, but not at AWS.