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diff --git a/app/models/backends/terraform_aws_using_ami.rb b/app/models/backends/terraform_aws_using_ami.rb
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+# GOV.UK Mini Environment Admin
+# Copyright © 2018, 2019  Christopher Baines <mail@cbaines.net>
+#
+# This file is part of the GOV.UK Mini Environment Admin.
+#
+# The GOV.UK Mini Environment Admin is free software: you can
+# redistribute it and/or modify it under the terms of the GNU Affero
+# General Public License as published by the Free Software Foundation,
+# either version 3 of the License, or (at your option) any later
+# version.
+#
+# The GOV.UK Mini Environment Admin is distributed in the hope that it
+# will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public
+# License along with the GOV.UK Mini Environment Admin.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+# == Schema Information
+#
+# Table name: terraform_aws_backends
+#
+#  id                    :integer          not null, primary key
+#  label                 :string
+#  aws_region            :string
+#  aws_access_key_id     :string
+#  aws_secret_access_key :string
+#  created_at            :datetime         not null
+#  updated_at            :datetime         not null
+#  domain                :string
+#  route_53_zone_id      :string           not null
+#  vpc_id                :string           not null
+#  ssh_public_key        :string
+#  ssh_private_key       :string
+#
+
+require 'ruby_terraform'
+
+class Backends::TerraformAwsUsingAmi < ApplicationRecord
+  include MiniEnvironmentMethods
+  include BackendMethods
+
+  has_many :mini_environments, as: :backend
+
+  self.table_name = 'terraform_aws_using_ami_backends'
+
+  def self.label
+    'Amazon Web Services (using AMIs)'
+  end
+
+  def self.available?
+    File.exist? "#{ENV['PATH'].split(':').first}/terraform-provider-aws"
+  end
+
+  def type_and_id
+    "#{self.class.name}=#{id}"
+  end
+
+  def common_terraform_variables
+    {
+      aws_access_key: aws_access_key_id,
+      aws_secret_key: aws_secret_access_key,
+      aws_region: aws_region,
+      ssh_private_key: ssh_private_key,
+      aws_route_53_zone_id: route_53_zone_id
+    }
+  end
+
+  def build_remote_host
+    RemoteHost.new(
+      'ubuntu',
+      backend_latest_terraform_state.output_value('guix_daemon_public_dns'),
+      ssh_private_key
+    )
+  end
+
+  def terraform_state_id
+    "backend/terraform_aws_using_ami/#{id}"
+  end
+
+  def guix_public_key
+    "(entry #{File.read("/etc/guix/signing-key.pub")} (tag (guix import)))"
+  rescue Errno::ENOENT
+    # This is optional, as if it doesn't exist, it means that `guix
+    # copy` won't be used
+    ''
+  end
+end