Your wedding guest book is unusual because nobody can make another one.
Liumy can make another album.
You can buy another camera.
You can order more film.
But you cannot recreate the photograph your grandmother took that evening.
You cannot reproduce your father's handwriting exactly as it appeared beside his picture.
You cannot bring the same group of friends back to the same table and ask them to write the same ridiculous message again.
That's why learning how to store Polaroid photos after the wedding matters.
If you used Polaroid film, respect the initial drying period.
For any instant photographs, protect them from strong light, moisture and extreme environmental changes.
Keep them in a quality album made with appropriate materials.
Find safe archival storage for the extras.
Then make a digital copy of every page.
Your physical guest book should still be opened.
Passed around.
Laughed over.
Shown to your children.
Maybe one day shown to your grandchildren.
Preservation doesn't mean hiding it away and never touching it again.
It simply means giving those photographs the best possible chance of still being there when you're ready to open the book again.