Shutdown the container
  
  # lxc-stop -n $NAME
  Archive container rootfs & config
  
  # cd /var/lib/lxc/$NAME/
  
  # tar --numeric-owner -czvf container_fs.tar.gz ./*
  
  # rsync -avh container_fs.tar.gz user@newserver:/var/lib/lxc/
  
  Extract rootfs

  # mkdir /var/lib/lxc/$NAME/
  # cd /var/lib/lxc/$NAME/
  # tar --numeric-owner -xzvf container_fs.tar.gz .
  
  
https://stackoverflow.com/questions/23427129/how-do-i-backup-move-lxc-containers