Iam not taking about backup of lost data.Iam telling that those data can be misused if falled in wrong hands.
If there is data whether offline or online it can always be misused. And that's why we hv do many fake documents / benami property etc.
So Aadhaar is not different. It's not like only Aadhaar data is being misused now and there is no misuse of pan card/driving licence/voter card/ration card/bank details.