The backup is running at a remote site in respect to the Veeam B&R Server.
Though both repositories tested (NetApp as well as QNAP for comparison) are CIFS targets in the same subnet on the remote site.
Also the ESX-host, the proxy used and the gateway Server are at the remote site in the same subnet.
The only difference is the CIFS target used. Using the NetApp slows down the speed by some orders of magnitude compared to the way cheaper QNAP.
As said: When we copy any large file directly using Windows Explorer from the same gateway server, the speed is fast and almost the same for both Targets (1G-Ethernet).
So only through Veeam's DataMover we get the behavior.
We just upgraded to 9.5U2 as requested by support. No changes.
Bottleneck is always 99% target. Sometimes also 99% network (which does not make any sense as proxy and gateway are on the same VM).
But mostly 0-2% for everything except "target".