Artisan Archive

Just a quick question. Now that I'm starting a bunch of harvesters to get all my medicine requirements, what happens to harvesters after a resource switch? More specifically, if I have some of the old resource in the hopper, does it dissappear? Does the harvester keep working after the switch? Does it just go to the highest concentration resource? Any help here would be much appreciated.

Stuff in the hopper remains.

The harvester turns off.

It consumes maintenance

It does not consume power