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Why can't I back up my chat log to WeChat's server or a cloud service?
WeChat was designed with your privacy and safety in mind. For this reason, WeChat will not store your chat log or message history on our servers to make sure that third-parties including WeChat itself are unable to view the content of your messages. 

Cloud backup feature is no longer available from WeChat 6.2.5 . However, your chat history will be kept permanently within the app on your device as long as the app is not removed and the phone has sufficient storage space. Or, you can back up your chat history to WeChat for Windows.

If you wish to back up your chat log or transfer your chat log to a new device, use the "Chat Log Migration" or “Favorites”.