Hi,
look into /etc/pve/nodes/<nodename>/qemu-server/ for VMs and /etc/pve/nodes/<nodename>/openvz/ for Containers (in 3.4 in 4.0 it's the lxc folder).
Change <nodename> to the respective node name.
Note also that we have a symlink where /etc/pve/qemu-server/ points at the local nodes qemu-server folder.