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backup - Primary and secondary name servers : Do they have to be hosted in same company?

I have my domain hosted and I received to two name servers to be updated with my domain registrar ns1.hostingcompany.com ns2.hostingcompany.com , I know if the primary name server goes down DNS server automatically point my domain to the secondary name server but my question is what happens my host's whole system goes down? Since ns1 and ns2 are belong to the same company would my domain resolve to anything ? or can I have ns2 in a different server with a different company? if so how do I configure the ns2 backend ? Thank you

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