The EU and US data centers are completely separated. You can't even use both from the same account. To change, you need to open a completely new account selecti

The EU and US data centers are completely separated. You can't even use both from the same account. To change, you need to open a completely new account selecting EU at the start. So it's not really easy to use both at the same time and there's definitely no redundancy across data centers if you're a customer in the EU.