gistfile1.rb

safe do
  local :path => "backup/:kind"

  tar do
    archive "a1", :files => "some-directory-to-backup"
  end
end

require "fileutils"

exit unless from = Dir['backup/archive/archive-a1*'][0]
puts "from: #{from}"
to = "backup/archive/#{Date.today}-#{File.basename from}"
puts "to: #{to}"
FileUtils.mv from, to