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I'm not sure if there is a way to do that until someone manages to build a custom recovery (clockwork mod, twrp) for the onyx devices. How ready that is probably also depends on how supportive onyx are towards developers.
I had been thinking about this myself, but have no experience developing for a new device and currently don't have any time to learn enough about this.
Alternatively, I think of you're rooted you may be able to take a backup via adb, though I'm not quite sure exactly which commands you need.
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