The default backup time for WhatsApp is specific (in my case, it's 4:00 AM).
Although we can manually backup at any time, how do we change the default backup time?
Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. It only takes a minute to sign up.Sign up to join this community
You cannot change the Whatsapp backup time to the local device storage. But optionally, you can have Google drive as your backup destination and can schedule it to backup as you wish (Monthly, Weekly, Daily or On click).
Google drive can backup your photos and videos along with the chat content in your Whatsapp account.