I understand that, but since I already have filled it with some stuff I have to use samba
samba shares seems to work so I stick with that, thanks for the help anyway 
Just a little puzzled because I searched for a format for my new hdd that would work best with the pie, but apparently I chosed the wrong for nfs.
It’s not a wrong file system format for NFS. It’s wrong format for Linux at all.
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yeah thats what I meant, for linux
As far as using the hostname
From my experience here with DietPi version 9.02 you would need to run the command
dietpi-software install 152
This will install the avahi-daemon, you may get several errors on install but it still works after a reboot. You can check on the service with
systemctl status avahi-daemon
Here the default hostname was discoverable from macos as DietPi.local