Being a technology reviewer, I change my handsets quite frequently. Every time I insert my SIM card on new phone, I am presented with the task of taking a complete backup from my previous device and restoring it on the new one. Though transferring phone data — files, photos, videos, etc — is fairly easy, especially if your new phone runs on the same operating system as the previous one, you need a completely different method to transfer data from apps. Here is how you can back up your WhatsApp chat history on Google Drive, phone’s internal storage or microSD