Here is a tool that I whipped up: Shelve It.
It’s a simple Python script that will duplicate your current MotionBuilder take, name it using the original take’s name but add the suffix “_Shelved”.
It can come in hand when you want to explore some more changes on a take you are currently editing. It provides the user the flexibility to store their data without saving the scene and then re-loading the scene if the changes are not for the better.
It was fun the make.
I hope this helps.