You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sftp.rb
    path of file: ./repos/backup/lib/backup/storage
    
    the code of the file until where you have to start completion: require "net/sftp"

module Backup
  module Storage
    class SFTP < Base
      include Storage::Cycler

      ##
      # Server credentials
      attr_accessor :username, :password, :ssh_options

      ##
      # Server IP Address and SFTP
    
      def transfer!
        connection do |sftp|
          create_remote_path(sftp)

          package.filenames.each do |filename|
            src = File.join(Config.tmp_path, filename)
            dest = File.join(remote_path, filename)
            Logger.info "Storing '#{ip}:#{dest}'..."
            sftp.upload!(src, dest)
          end
        end
      end