I'm on a mid 2010 Mac Pro, so I don't have USB 3 or thunderbolt, but APFS with Firewire 800 feels slower than USB 2 with HFS+.
In the past if I had done something like this I would have seen the progress bar scream along with the appearance of super fast copy rates as smart update worked it's magic. The whole process feels much slower now, including the initial preparation and final phase with prebinding etc. Should I wipe the backup drive and format it as HFS+ I wonder. I'll send over the log so you can take a look.
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