Azure backup VPN tunnel

Nope.

There are no settings for creating metrics and traffic priorities, you're also stuck with Dynamic Routing so all the prioritizing is done in the background.

This means that you cannot connect different endpoint to the same range of a local network. it is even stated in "Requirements and considerations" page under the Vnet VPN Documentation.

Redundant tunnels between a pair of virtual networks are not supported.

https://azure.microsoft.com/documentation/articles/virtual-networks-configure-vnet-to-vnet-connection/

Edit

Here's a better answer:

Can I configure multiple tunnels between my virtual network and my on premises site using multi-site VPN?

No, redundant tunnels between an Azure virtual network and an on premises site is not supported.

https://msdn.microsoft.com/en-us/library/azure/dn133803.aspx