EDIT: 7 Seagate Backup Hub 8TB and 1 WD Elements external drive (the target drive).
Computer is a Dell Vostro 260 with i5-2400, 8GB RAM, 2TB Patriot P210 SSD boot drive, and 8 Seagate Backup Hub 8TB external hard drives connected to two PCI-E USB 3.0 cards with 5 USB 3.0 ports each. The computer is set to Never for when the screen and computer will shut down and the power profile is Performance.
Been trying since Monday to transfer a little over 6TB of data. Before the data transfer I checked for updates and the computer downloaded all the available updates and installed some and required a restart for another. After the restart I checked for updates again and nothing showed up so I began the transfer before going to bed. I think the estimated time was 15 or 16 hours. I turned off the monitor and went to bed. The open windows were task manager, two file explorer windows showing drives :K (source drive) and drive :L (target drive), and the little file transfer window showing about 130 MB/s.
The next morning I turned on the monitor and it was just the desktop and no windows open. I opened file explorer and only about 1TB transferred over. Usually if I restart the computer with task manager still open the computer will restart and have task manager open.
I went to settings to check for updates and none were found. I paused updates for 7 days and retried the transfer again before going to work. I turned off the monitor. Came home from work and turned on the monitor and again it was just the desktop. I opened file explorer and about 3TB total transferred, including the 1TB from the original attempt.
I went to Device Manager and have three instances of "USB Mass Storage." I went to properties and then Power Management tab and unchecked, "Allow the computer to turn off device to save power" for all three. I then retried the file transfer. The next morning I turn on the monitor to just the desktop. I turned off the computer and went to work. Got home and before bed I retried the transfer. Of course I wake up and turn on the monitor to nothing but the desktop.
Any other settings I need to check and change? It's annoying not being able to transfer all that data in one go.