Heroku bundle downloader -- just add cron

Rakefile

require 'rake'

APP_NAME = 'heroku_app_name'
BACKUP_PATH = '.'

namespace "heroku" do
  desc "create a new Heroku bundle and download it, name with timestamp - only use with single bundle addon"
  task "backup" do
    require 'fileutils'
    
    app_option = "--app #{APP_NAME}"
    bundle_name = Time.now.strftime("#{APP_NAME}-heroku-bundle--%Y-%m-%d--%H%M").downcase
    
    unless %x{ heroku bundles #{app_option} | grep complete }.empty? 
      puts "Removing existing bundle before proceding"
      sh "heroku bundles:destroy #{app_option} $(heroku bundles #{app_option})"
    end
    
    sh "heroku bundles:capture #{app_option} '#{bundle_name}'"
    
    waited = 0
    while %x{ heroku bundles #{app_option} | grep complete }.empty? && waited < (maxwait=200)
      seconds_to_wait_before_retry = 10
      waited += seconds_to_wait_before_retry
      puts "Heroku hasn't finished bundling the app & database."
      puts "Waiting #{seconds_to_wait_before_retry} seconds to try again. (#{waited} of max #{maxwait})"
      sleep seconds_to_wait_before_retry
    end
    
    # download & destroy the bundle we just captured
    %w(download destroy).each do | action |
      sh "heroku bundles:#{action} #{app_option} '#{bundle_name}'"
    end
    
    FileUtils.mv "#{APP_NAME}.tar.gz", "#{BACKUP_PATH}/#{bundle_name}.tar.gz"
    puts "Bundle captured and stored in #{BACKUP_PATH}/#{bundle_name}.tar.gz"
  end
end

# references:
# Ben Scheirman http://flux88.com/blog/scripting-heroku-backups/
# Matt Buck http://github.com/techpeace/heroku_backup