/**
  * Read the file system from the jive properties.
  *
  * @return A <code>FileSystem</code>.
  */
 private FileSystem readBackupFileSystem() {
   final String thinkParityBackupRoot =
       properties.getProperty(JivePropertyNames.THINKPARITY_BACKUP_ROOT);
   final File thinkParityBackupRootDirectory = new File(thinkParityBackupRoot);
   if (!thinkParityBackupRootDirectory.exists())
     Assert.assertTrue(
         thinkParityBackupRootDirectory.mkdir(),
         "Could not create directory {0}.",
         thinkParityBackupRootDirectory);
   return new FileSystem(new File(thinkParityBackupRoot));
 }