your approach sounds similar to mine. rather than net shares in containers i've found it simpler to add host mountpoints to the LXC conf file as desired.. e.g > _ shares from network added in Proxmox WebUI at host mountpoints ( /mnt/eg, /mnt/like, /mnt/this ) host storage ( i.e - zpool at /thing) i want to share ( e.g - /thing/share ) is passed through as mountpoint to samba LXC // then i drop these few lines in any new container conf and it's set mp0: /mnt/pve/eg/share,mp=/mnt/eg mp1: /mnt/pve/like,mp=/mnt/like mp2: /mnt/pve/this,mp=/mnt/this mp3: /thing/share,mp=/mnt/thing this helps double fold in container backup data remains small, and allows for separate layers of retention for the shared/mounted data.

On the Datacenter go to storage->add->nfs or cifs whatever you want. Now the share is mounted to the main node. From here you can just bind mount it to your lxc. Just edit the lxc conf file according to the proxmox guide for bind mount. Haven’t tried that with a VM but for lxc it works just fine.