Good day,
A spare link and a router is not mandatory, but the risk can be high
if connection will go down. Can you accept it?? In other ways it
depends what kind of information goes through it. If it's e-mail, then
you can buy another e-mail provider and make a secondary MX. Different
ways to make risk lower.

--
Regards,

Ruslan O. Nesterov
Security Arhitect
http://www.ruscrypto.com

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