[Also see scotch.io] (https://scotch.io/tutorials/how-to-create-a-vagrant-base-box-from-an-existing-one)
cd homestead
vagrant package --output ../boxes/homestead.box
vagrant box add homestead_100gb ../boxes/homestead.box
cd ..
mkdir homestead_100gb
vagrant init # or copy VagrantFile from somewhere else and change config.vm.box to "homestead_100gb"