Don't quite get how this works - I thought TM could only back up one partition - the current boot drive - to an external. How does the partition of the backup drive get backed up via TM?

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No. By default it seems to backup every partition from *internal* hard drives, but not external hard drives. So if you using an internal hard drive, you don't have to do anything. It should just work.

For those who want to do this with an external hard drive, you still can with one small change. If you go into the system preferences, and then time machine, and click options, it will list folders and partitions to omit from backing up. Not surprisingly, if you have time machine setup, it will list the time machine partition in this list. This is so that it doesn't back up the partition to itself.

If you are using an external hard drive to do time machine, it will list all of the partitions on that hard drive in this list. So just remove the second 'idisk mirrored' partition from this list, and it will start to backup that partition to the first partition.

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