right ok...
bad practice I know, but checking everything (we have no traffic shaping) we're getting around half of the speed on the CBT backup in veeam.
At least now I know the target we should be after.
Ok so the branch mx is connected to a MS switch. I can see the duplex is auto 1Gbs. looks fine.
The source mx connected to a catalyst, that's also 1Gbps full duplex.
I don't think it's a duplexing issue but can see why you suggested it.
is there anything else I can check?