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