I'm not saying that it's not possible, but I don't see why Aeotec (et al) would waste time/space backing up a sensor value. If it were me, I'd just be concerned with backing up node information, parameter values, neighbor lists, etc. That said, the Z-Wave specification contains information on transient things like the "last successful route" which I suppose could change during the backup cycle. I can see the benefit of taking multiple snapshots of the hardware to compare against one another--and they could easily ignore certain immaterial differences in the comparison.
I'd be curious to learn what the difference is.