When I pick and choose files to copy to or from a single device, Nautilus accumulates file operations in parallel:
I worry that in certain circumstances this could cause fragmentation of the destination device, or transfer slowdowns due to scattered reads on the source device and increased network connection overhead.
How can I queue these file operations instead, so that each operation starts only after the previous one has finished?
See if this related question and its answer can help you: Is there a copy handling progam available that can queue, pause and resume?
It suggests using an application other that Nautilus, that AFAIK cannot do what you ask.