There will be no benefit at all speed wise, Yes, you will have a redundant connection if one is down. You will be able to control wha services go to what card though.
Perhaps 192.168.1.100 is the first, but you want any connections to your web server to be through 192.168.1.101 for logging purposes.
Or, with 2 interfaces, you may want to have that box be the router to a net under the second card.
If nothing else, It will be a good learning tool for setting up a router or VPN
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