Harvesting on and full node off

I have 2 compter one could be the full node where I make plotting too with windows and GUI runs, other one an old pc with an external drive where I put the final plot, it has Ubuntu 18.04
Well The old pc has big problem with the GUI so can I start just the service of Harvesting and keep it always on while turning off the full node?
Or the full node is necessary always on?

Thank you

You won’t be able to farm without the full_node turned on. Machine running harvester can run only the harvester. But without the farmer connected to full_node sending it messages, it won’t know what to harvest.

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thank you so both they have to stay on.