My two year old boy was also able to find both the “delete all” and “confirm” buttons on the Vado. He even managed to record new videos on top of the clean file system, so I was in deep trouble.

TestDisk didn’t help, but you led me to find PhotoRec (from the same magicians that make TestDisk), and it saved videos from my brother’s wedding as well as my youngest son’s first hours and days.
Backups have been made this time!