Thanks to MacOS–though it was really an OS X feature–being able to repartition on the fly, my big clone/Time Machine/scratch partition project took all of fifteen minutes. Maybe. I wasn’t at the computer while it was repartitioning the external disk. And now the Time Machine backup is done, the clone(s) are done….
So I think the big QNAP-to-Synology, 6TB-to-19TB file transfer is done. It’s sturdy, it’s dependable, but it’s not entirely exciting. It’s not supposed to be exciting, of course. Data storage is just data storage.
Though I am giving myself a “look through the smaller QNAP NAS” to see what’s on there, as I now have plenty of room to move it onto the Synology