What Should I do with Obsolete Buildings after a Refactor?

I'm in the process of upgrading my mining, smelting, and chip making areas with Big Miners, Foundries, and EM Plants. I have a ton of Electric Miners, Electric Furnaces, and Blue Assembling Machines. What should I do with them?

I'm thinking of just recycling them all just for rare (I don't have epic or legendary unlocked yet) ingredients. Is there any use of saving them for future needs?