It takes a while but it does the job!
It takes a while. About 4 hours or more. Depending on the size of the data. And it install a special version that can't be updated. That need to be uninstalled and re installed with the official one later. Which some may have problem with the activation/verification time period by whatsapp. But it deffinetly does the job! Simple and with step by step instructions. Recommended.