How to Preserve the Wedding Cake
Here's a brief article with great ideas for the anniversary wedding cake. Columnist Jane Greig says, yes you can freeze cake for a year, but don't expect it to taste good. If you do want to store it for a year, wrap it in an airtight container, then wrap it again with plastic wrap and again with aluminum foil.
But alternatively, she suggests, when you get your wedding cake, ask the baker if he/she would allow you to purchase a discounted wedding topper. A baker quoted in the story says they often give a free one-year anniversary cake to couples (who purchase a multi-tiered wedding cake) in most instances.