Exporting website to be archived and accessed offline

Hello, 

I have created a website with a subscription for our wedding a few years ago and now my wife and I would like to export the whole website to be archived. However, we wonder if it's possible for us to export it in such a way that it would still be accessible offline as a reference, years down the road.

We would be happy to explore any free or paid options to do so. 

Many thanks!