You should be able to plot the files with any system and copy them wherever, given the fact that you set your plot's parameters to the wallet address (numerical ID) you want to ultimately use for mining. And no, you shouldn't have to do anything special, just keep the format the same when copying. There is only a slight downside to making many smaller plots - it may just take slightly longer to read multiple files over just one single file. But this is not a huge difference.