The command 'zfs get mountpoint' can return 'none' and so 'mountpoint none' was written to storage.cfg, which would block the fall-back to using the default mount point when requesting a path, see [0]. [0]: https://forum.proxmox.com/threads/zfs-backup-with-snapshot-mode-fails.61927/#post-284123 Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>