Develop a Comprehensive Guide: How to Recover Deleted Whatsapp Messages

I need a detailed and user-friendly guide on how to recover deleted messages on WhatsApp. The guide should cover various scenarios and methods for both Android and iOS devices. Key topics to include are:

- Understanding WhatsApp's backup mechanisms (Google Drive, iCloud).
- Step-by-step instructions for recovering messages on Android.
- Step-by-step instructions for recovering messages on iOS.
- Common reasons for message deletion and how to prevent data loss.
- Limitations and potential challenges in the recovery process.

The final deliverable should be a well-structured, clear, and easy-to-follow article or document, suitable for a general audience looking to retrieve their lost WhatsApp chats.