Comment by alin23

Not really. macOS may wait for idle time, may prioritize internal disk and the backup will go extremely slow on an HDD, there's no notification whatsoever.

It's a very specific thing for me really, I connect the HDD specifically for doing backups as fast as possible then I want to disconnect and store it back so I can keep using my laptop. I don't have a desk anymore where I can keep these things connected all the time.