Where LXC Container files are stored?
LXC containers are stored in folder /var/lib/lxc
Each container have a folder, which contains
/var/lib/lxc/VM_NAME_HERE/config = configuration file /var/lib/lxc/VM_NAME_HERE/rootfs = file system used by lxc container.
LXC container OS templates are stored in
/usr/share/lxc/templates
See LXC