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DMVPN: Spoke with Dual ISP to Hub with Single ISP

We are setting up a DMVPN backup network.  Our hub locations has a single interent connection and some of our spoke locations will have dual internet connections for backup.  One will be a NATed connection from a consumer broadband supplier and the other will be a 3G (last resort) connection.  The device we are using is the new 819.

I am planning on setting up two tunnels from the spoke:

Tunnel1 = Internet based tunnel

Tunnel2 = 3G based tunnel

Both tunnels are going back to the same hub IP address.  For testing we are using PSK but planning on migrating to PKI.

My quesion is: do I need to create two tunnels on the hub router, one for each source tunnel? If so, how do I distinguish them since they share the same interface IP?

Thanks ahead of time.

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