Geographical redundancy

Is there any feasible way to achieve geographical redundancy of postgresql database?

Say you have a website which uses PG on the backend to read/write data and you want to have the website running on 2 separate servers distributed geographically and have the data synchronize somehow over the internet.

In case one data center fails, website is still up and running from 2nd geographical location (from say 2nd DNS server).

Thank you.

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