This is a scratchpad for noting some disk transfer speeds. There are so many potential configurations, and possible bottlenecks…
Dell PE1800 w/PERC6 SATA 1.5 over USB2 to external HDD, ntbackup.exe, 4.8 megabytes per second.
Home PC disk to disk, 7200RPM, 904MiB directory, 23 seconds. 39.3 MiB/s.
There’s a discussion of Samba to SATA speeds and the general top limit is 50MiB/s because of the disks, but things like slow nics and cpus can make performance of CIFS worse. Specific software, like ntbackup.exe can be slow
Comparison Table of Time to Copy Data (rough guesstimates)
SIZE SPEED 100GB 500GB 1TB 5MiB/s 5.5hr 27hr 52hr 20MiB/s 1.3hr 6.5hr 13hr 40MiB/s 42min 3.6hr 8hr 1Gb/s (GigE) 10min 1hr 2hr
Note that no disks run at full gig ether speeds, so those numbers are just for transferring data. 40MiB/s is probably the current maximum for 7200rpm disks.