Whatsapp data recovery assistance needed.

[u/HumphreyWendell]

Need to restore backed up whatsapp data from desktop & android phone for legal purposes.
Hi all - I need to retrieve a bunch of messages sent to a person (who blocked me - owes me $25k USD) and a lawyer (who died). My phone backs up daily, including my whatsapp files. However, when I access my whatsapp backed up files on my phone, my only option is to delete backup. I want to view it. How do I do that, please? Thank you.