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If you have one physical connection to your web server (at home) and the connection gets severed then there is no way. If you have two providers with two separate physical lines then the second would provide redundancy. At the end of the day your IP (static) is not dependent on the hardware that connects you to the internet (uplink).
What you mentioned with routing and other things. You can have multiple servers located in separate geographical locations and run what's called a round robin DNS. That would be what most companies do these days. But you have separate physical locations.
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