I think that it's rather hard to understand the technical lingo due to this being a new algorithm and all, so here's an analogy:
Generating plots are like making treasure maps. It is:
1) Okay to transfer your treasure maps around because they will still contain the same information about the treasure(i.e. you can copy and paste a generated plot onto another HDD and mine from there)
2) Not useful to copy and paste the same treasure map and try to mine from both locations, because they'll all be telling you the same treasure locations (i.e. you cannot duplicate your generated plots onto different HDDs and run miners on both, both miners will be calculating the same nonces)
3) Okay to stop generating treasure maps for awhile, and continue generating from the
last treasure map you've generated. (you can stop generating nonces to do other work, but when you continue, be sure to configure your run_generate.bat to start generating from the last nonce that you've generated).
I'm not sure if that is helpful to you, but it was to me in trying to understand this whole PoC thing. Best of luck in mining! Only got 2 blocks here, and I've got a 256 Gb plot!

Very nice analogy and easy to understand, thats how i got it too.