We've recently installed Veeam Backup & Replication.
All VM's are backup-ed at normal speed. However, our file server (about 1.1TB) is backing up at slow rate of +-6MB/s.
This is taking so long, that the backup task fails every time.
To exclude interference, I've created a separate backup task which runs alone.
Veeam server is a Hyper-V VM Windows server 2012R2 (8GB RAM, 4 cores)
Backup target is Q-Nap
File server contains multiple VHDX, only the ones with server 2012 data-dedup appear to experience this problem.
Bottleneck according to Veeam is 'target'. Normal file copy's to the target are high speed.