Quote:
Originally Posted by mightyduck
O.K. but I don't need to know to the minute. Just whether is a day or a couple hours or what, roughly for Thunderbolt 3.
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“Thunderbolt 3” tells us nothing that useful. Does that drive have a slow 4,800 rpm disk inside it or a NVNe SSD? Raw performance on these drives can differs by more than an order of magnitude.
And how large is the drive you are backing up 1TB? 2TB? 4TB?
You can start with an assumption of 1hr - 1.5 hr per TB (used capacity) for a decent HDD and just try and see.