I mentioned that USB2 can't maintain it's maximum speed over long periods of time. My experience is that USB2 "chokes" when copying for that long so it may take a little more time than that. So for 200GB of data, my benchmark infers something around 8 hours over USB2.
#How to start a time machine backup mac mac#
I believe your Mac has a Firewire800 port so a 25GB file would be less than the 40min it took with my Firewire400 drive. So to improve, definitely replace the USB drive with a Firewire one. (The drive had both Firewire and USB2.) You can see why Firewire is usually recommended for transfering large amounts of data. That said, my experience a while ago when copying a single 25GB file, it took 40min using Firewire400 versus 2.5hrs over USB2 to the same hard drive. They see how many "files per second" are being copied, so when it takes several minutes for just one large file, the OS thinks that the copy is slowing down, when in fact the same bits-per-second is happening.
#How to start a time machine backup mac windows#
But Windows and OSX's time calculations assume "average copying" of small files and can't correctly calculate when a large file is copied.
On paper, USB2 has a burst speed of 480Mbps, but often can't maintain that speed over long periods of time.
If that is true, then the time calculations are not accurate because USB2's throughput is too inconsistent. Something like multiple 10-20GB video files. With 200GB of data, I'm assuming you have a bunch of very large files.
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