Curtis1973

Android Expert
Jul 1, 2012
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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.