Mac OS X only: Free software iPodBackup saves an encrypted disk image of your home directory to your iPod, for secure and easy data backup. To use iPodBackup, your 'pod has to be set for use as a disk (in iTunes Preferences' iPod tab, check off "Enable disk use.") Besides the super-secure encryption, iPodBackup also does incremental backup - meaning, if you ran the backup last week and then again