backup

I have an old iPad and want to transfer the whatsApp chat history from it to Galaxy Tab. I am wondering what is the right way to do that? Can]t find an answer from the official documentation.

I am looking for an solution to backup the data I am concerned such as messages, photos and media library instead of a while backup. Also, I prefer to back up those data on a computer other than cloud service as the internet connect is not good in here. Any ideal?