I just bought Hard Disk Manager 17 and do some backup. Do you also experiment very slow backup?
To backup 500Mb of data from an internal disk to a USB3 drive (VHDx container), it took 5hrs 20 min. Same operation using simple copy *.* took only 1hr 30 min.
1.37 TB, same internal to USB3 drive), took 15hrs rather than an expected 3-5 hours (copy *.*)

I can understand that a backup will be slower than a simple copy *.*, but not by this magnitude,

Do you experiment the same?