# File lib/sprockets/manifest.rb, line 192
      def backups_for(logical_path)
        files.select { |filename, attrs|
          # Matching logical paths
          attrs['logical_path'] == logical_path &&
            # Excluding whatever asset is the current
            assets[logical_path] != filename
        }.sort_by { |filename, attrs|
          # Sort by timestamp
          Time.parse(attrs['mtime'])
        }.reverse
      end