WhatsApp is a great way to stay in touch with your loved ones, but you don’t want to lose all the conversations when you change phones. It’s super easy to back up your messages right from WhatsApp. Here’s the skinny.
Start by opening WhatsApp, and then tap the three-dot menu in the upper-right.
Tap “Settings.”
Select “Chats.”
Tap “Chat backup.”
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Source: How-To Geek