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Taking an offline snapshot of a VM on an NFS/CIFS storage with snapshot-as-volume-chain currently creates a volume-chain snapshot as expected, but taking an online snapshot unexpectedly creates a qcow2 snapshot. This was also reported in the forum [1]. The reason is that the NFS/CIFS plugins inherit the method volume_qemu_snapshot_method from the Plugin base class, whereas they actually behave similarly to the Directory plugin. To fix this, implement the method for the NFS/CIFS plugins and let it call the Directory plugin's implementation. [1] https://forum.proxmox.com/threads/168619/post-787374 Signed-off-by: Friedrich Weber <f.weber@proxmox.com> Link: https://lore.proxmox.com/20250731082538.31891-1-f.weber@proxmox.com