# File lib/right_slicehost.rb, line 204
    def list_backups(sls_id=nil)
      req    = generate_request(Net::HTTP::Get, build_path(:backups, sls_id))
      result = request_cache_or_info(:list_backups, req, BackupsParser, sls_id.nil?)
      sls_id ? result.first : result
    rescue
      on_exception
    end