Is it possible to make whatsapp messages static?

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Hello all.
I've got important heartfelt relational messages on my Samsung galaxy S3-mini. In November it will not be supported anymore on this phone.
Calling out to all experts...is it possible to disable whatsapp, and to use this phone to watch the whatsapp-messages indefinitely offline. Please help!!
Thank you,

Francis

System Configuration: Android / Chrome 93.0.4577.82