Android Expert
Jul 1, 2012
Greenville,SC USA
Just curious as to why that option has never been added to any stock recovery. Why do you think it's never been adopted as a needed feature.
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Not usually in recovery, but some manufacturers do provides a means of backing up your data before doing any firmware updates. Oppo does, and as @Hadron mentioned, there's Google as well of course.
Thinking about how it would work with Samsung Knox firmware. If you were able to make a nandroid backup of Stock 5.1 with stock recovery then updated to 6.0, would Knox let you restore the 5.1 backup? Usually can't downgrade.