Just found this on the Proxmox Wiki https://pve.proxmox.com/wiki/Performance_Tweaks#VZdump stating that the default value for vzdump is limited to 10000 Kbps (10 Mbps). This might explain even my misunderstanding why backups to my NAS are pretty “slow”

sudo  vi /etc/vzdump.conf

showed that the original line in Proxmox 3.2 is #bwlimit: KBPS which I changed for now without notable issues to

bwlimit: 40000
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