Back up
How to retrieve your WhatsApp chats by restoring your iPhone from a previous backup?
iPhone 6s Plus, iOS 13
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Any backup is always overwritten be it WhatsApp backup, iTunes Backup or iCloud Backup.
What you have is the last backup there is nothing called the previous backup.
However...
WhatsApp is not an Apple product. Contact the app developer here --> App Support or WhatsApp FAQ Or Restoring your chat history - WhatsApp FAQ or Contact WhatsApp
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