[kamikaz1k]

Well that's not true.

Chaos engineering and AWS weren't real things when they started building the company. And the system they have now doesn't resemble much of it was once.

Truth of the matter is they invested more in their infrastructure, but that's because their business plan required them to grow on the back of technological advances. Banks, it's seems, do not. Or maybe they do, and the some of these start up banks will usurp them.

[ianai]

Standard good practice should be to have a redundancy in place and test it at a regular interval. It should be part of periodic maintenance - fail to the backup so updates/grades can be applied to production and fail back to production once done.

But I’m guessing wellsfargo just doesn’t have a reason to care.