backup_folder.rb

require "fileutils"
require "pathname"
require "date"

require "rubygems"
require "zipruby"

BACKUP_FOLDER = Pathname.new("/path/to/backup")
timestamp = DateTime.now.strftime("%Y%m%d%H%M%S")

folder = BACKUP_FOLDER + Date.today.strftime("%Y%m%d")
FileUtils.mkdir(folder) unless File.exist?(folder)

ARGV.each do |path|
  Zip::Archive.open((folder + (File.basename(path) + "-" + timestamp)).to_s + ".zip", Zip::CREATE) do |zip|
    target = Pathname.new(path)
    
    case File::ftype(target)
    when "file"
      zip.add_file(target.to_s)
    when "directory"
      Dir[target + "**/**"].each do |file|
        file_path = file.sub(File.dirname(target), "")
        case File::ftype(file)
        when "file"
          zip.add_file(file_path, file)
        when "directory"
          zip.add_dir(file_path)
        end
      end
    end
  end
end