@Kajetan321 Hello!

You can find how to make NFS ISO repository here: https://xcp-ng.org/docs/storage.html#iso-sr

If you want a quickly "how to" create the NFS for ISO SR, here's my notes (on Debian 11):

fdisk /dev/xvdb
mkfs.ext4 -b 4096 /dev/xvdb1
apt install nfs-kernel-server
mkdir /ISOs
mount /dev/xvdb1 /ISOs
emacs /etc/exports
/ISOs 192.168.X.0/24(rw,sync,no_subtree_check,no_root_squash)
exportfs -arv

Don't forget to add /dev/xvdb1 to fstab