iPodBackup is getting better and better and has now reached v1.3.
iPodBackup is a shell-script-turned-application (via Platypus) that backs up your home folder to your iPod using the open source backup utility called rsync. You can back up to a plain folder, to an encrypted disk image, or a regular disk image.
You can also customize a list of items to be excluded. By default, the Music folder, as well as certain cache folders are skipped, in order to prevent duplicating your music and because caches are a kind of stupid thing to backup.
[Via VersionTracker .]
It seems to be getting quicker too. With the holidays I hadn’t backed up to my iPod for probably at least a week. This morning’s backup took just a couple of minutes.