Erasing tablet of accounts/settings after removing kill switch?

Hey guys/girls, could anybody please tell me the best way of erasing personal info and "almost" going to factory settings but still retain the erased kill switch?

I'm on stock lollipop OS rooted with TegraOTA.apk deleted, but I have stock recovery, and do not wish to flash lollipop again so what ever is the easiest way without any chance of being stuck in situations requiring reflashing etc.

I noticed a backup and restore options in settings app, so maybe that's where to start?

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