code: public JournalBuilder setArchived(File to) {
          if (!to.exists()) {
              throw new IllegalArgumentException("<" + to + "> does not exist");
          }
          if (!to.isDirectory()) {
              throw new IllegalArgumentException("<" + to + "> is not a directory");
          }
          this.directoryArchive = to;
          return this;
      }
docs: Set the directory used to archive cleaned up log files, also enabling
  archiving.