Use fog to grab a file from S3 and save locally on server. Useful for transferring large backups from server to server where network prevents direct communication.

fog_pull_s3_backup.rb

require 'fog'
# Fetch and save backup on TARGET
storage = Fog::Storage.new({:provider => 'AWS', :aws_access_key_id => ENV['AWS_KEY'], :aws_secret_access_key => ENV['AWS_SECRET']})

dir = storage.directories.get('<YOUR DIR>')
file = dir.files.get "<S3 PATH TO FILE>"
output = File.new "<LOCAL FILE PATH>", "w"
output.write file.body
output.close