Some syncs and a final check that the drive unmounted

src/freedombone

   echo 'fi' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo '' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "if [ ! -d $USB_MOUNT ]; then" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  sync' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "  mkdir $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo -n '  mount $USB_DRIVE ' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "$USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  sync' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "  umount $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  sync' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo -n '  mount $USB_DRIVE ' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "$USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  sync' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo '  if [ ! "$?" = "0" ]; then' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "    echo 'There was a problem mounting the USB drive to $USB_MOUNT'" >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "    rm -rf $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
 
   echo 'sync' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "umount $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo 'if [ ! "$?" = "0" ]; then' >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  echo "Unable to unmount the drive. This means that the backup did not work"' >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo "  rm -rf $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  exit 46994' >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo 'fi' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "rm -rf $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo 'echo "Backup to USB drive is complete. You can now unplug it."' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo 'exit 0' >> /usr/bin/$BACKUP_SCRIPT_NAME