The main resource that you need in steady state is always electricity. For light, heat, pumps. And a lot of it, especially in winter time. The rest is mostly closed loop.

If you are preparing for Collapse, ensure you have multiple independent sources of electricity available. Solar, hydro, wind. If you are in a city you are better off with a storage room full of canned food since your hydroponic plants wont give you much food after power goes out.