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by 1qaz2wsx3edc 4669 days ago
> Multiple dynos are also more likely to run on different physical infrastructure (for example, separate AWS Availability Zones), further increasing redundancy.

It's not guaranteed. As I understand it, it's random.

And as for regions. They only help you locate content to a closer region. You cannot use them for balancing/redundancy. As any data or third party add-on you use, will manage it's data in it's own specific zone. Thus creating latency issues.