@zulhilmizubir If I may, what happens if the Internet link you dedicate to the backup experiences transient issues such as a spike in loss? I would suggest that dedicating one of the links purely for one function might not be the best solution. Given that Meraki MX appliances have some SD-WAN features why not take advantage of them? Create a Performance Class with values that make sense for the replication traffic, and then apply that PC with a Flow Preference. Sure, you can set it to prefer one link, but by using a PC you can have the replication traffic use the best link at any given moment. If one Internet link has issues the MX will move the flows to the other ensuring the best possible service for the replication traffic. You can also add a traffic shaping rule to ensure that the replication traffic has guaranteed bandwidth regardless of which link it's being sent across. https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/SD-WAN_and_Traffic_Shaping
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