I subscribe to YouTube TV and there is no more physical DVRs. YouTube TV allows you to record any show that you have access to, unlimited. So there is no way to physically attach your existing DVR (at least that I know of), but as long as you have Sunday Ticket and add the games to your subscribe list it should be there.

In YouTube TV there are 3 categories at the top of the screen: Library, Home and Live. The Library gives you access to all programs thar you've recorded.

Hope that helps

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RFS69