A simple rake task to dump the contents of a MySQL database and save it to an Amazon S3 bucket. Use together with whenever to automate it.

namespace :backup do

  task :nightly do
    timestamp = Time.now.strftime("%Y-%m-%d_%H-%M-%S")
    backup_file = "tmp/backups/#{timestamp}_dump.sql.gz"
    `mkdir -p tmp/backups`
    `mysqldump -u root {DATABASE_NAME} | gzip -c > #{backup_file}`

    send_to_s3 backup_file
  end

  def send_to_s3(file_path)
    bucket = "{BUCKET_NAME}"
    file_name = File.basename(file_path)
    AWS::S3::DEFAULT_HOST.replace "s3-us-west-2.amazonaws.com"

    AWS::S3::Base.establish_connection!(
      :access_key_id => '{KEY}', 
      :secret_access_key => '{SECRET}')
      
    AWS::S3::S3Object.store(
      "backups/#{file_name}", 
      File.open("#{file_path}"), 
      bucket)
  end

end