What is this  mobilebackup volume that just appeared?

I just noticed a new volume, Mobilebackup. I appears to be a few days old, and appears to have the same kind of files that Time Machine does. It has backup files of two volumes (of four), and has one folder for the first day, and varying numbers of folders thereafter.
What is this? Where is it? Why is it?

OS X Lion: About Time Machine's "local snapshots" on portable Macs

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