diff --git a/lib/tasks/globalize.rake b/lib/tasks/globalize.rake
new file mode 100644
index 000000000..37acb06cb
--- /dev/null
+++ b/lib/tasks/globalize.rake
@@ -0,0 +1,34 @@
+namespace :globalize do
+  desc "Migrates existing data to translation tables"
+  task migrate_data: :environment do
+    [
+      AdminNotification,
+      Banner,
+      Budget::Investment::Milestone,
+      I18nContent,
+      Legislation::DraftVersion,
+      Legislation::Process,
+      Legislation::Question,
+      Legislation::QuestionOption,
+      Poll,
+      Poll::Question,
+      Poll::Question::Answer,
+      SiteCustomization::Page,
+      Widget::Card
+    ].each do |model_class|
+      Logger.new(STDOUT).info "Migrating #{model_class} data"
+
+      fields = model_class.translated_attribute_names
+
+      model_class.find_each do |record|
+        fields.each do |field|
+          if record.send(:"#{field}_#{I18n.locale}").blank?
+            record.send(:"#{field}_#{I18n.locale}=", record.untranslated_attributes[field.to_s])
+          end
+        end
+
+        record.save!
+      end
+    end
+  end
+end
diff --git a/spec/lib/tasks/globalize_spec.rb b/spec/lib/tasks/globalize_spec.rb
new file mode 100644
index 000000000..2b00353d3
--- /dev/null
+++ b/spec/lib/tasks/globalize_spec.rb
@@ -0,0 +1,76 @@
+require "rails_helper"
+require "rake"
+
+describe "Globalize tasks" do
+
+  describe "#migrate_data" do
+
+    before do
+      Rake.application.rake_require "tasks/globalize"
+      Rake::Task.define_task(:environment)
+    end
+
+    let :run_rake_task do
+      Rake::Task["globalize:migrate_data"].reenable
+      Rake.application.invoke_task "globalize:migrate_data"
+    end
+
+    context "Original data with no translated data" do
+      let(:poll) do
+        create(:poll).tap do |poll|
+          poll.translations.delete_all
+          poll.update_column(:name, "Original")
+          poll.reload
+        end
+      end
+
+      it "copies the original data" do
+        expect(poll.send(:"name_#{I18n.locale}")).to be nil
+        expect(poll.name).to eq("Original")
+
+        run_rake_task
+        poll.reload
+
+        expect(poll.name).to eq("Original")
+        expect(poll.send(:"name_#{I18n.locale}")).to eq("Original")
+      end
+    end
+
+    context "Original data with blank translated data" do
+      let(:banner) do
+        create(:banner).tap do |banner|
+          banner.update_column(:title, "Original")
+          banner.translations.first.update_column(:title, "")
+        end
+      end
+
+      it "copies the original data" do
+        expect(banner.title).to eq("")
+
+        run_rake_task
+        banner.reload
+
+        expect(banner.title).to eq("Original")
+        expect(banner.send(:"title_#{I18n.locale}")).to eq("Original")
+      end
+    end
+
+    context "Original data with translated data" do
+      let(:notification) do
+        create(:admin_notification, title: "Translated").tap do |notification|
+          notification.update_column(:title, "Original")
+        end
+      end
+
+      it "maintains the translated data" do
+        expect(notification.title).to eq("Translated")
+
+        run_rake_task
+        notification.reload
+
+        expect(notification.title).to eq("Translated")
+        expect(notification.send(:"title_#{I18n.locale}")).to eq("Translated")
+      end
+    end
+  end
+end