How do you save it?
It's actually quite simple. If a baker knows that you are saving your top tier they will more than likely provide a box. Make sure you let your baker know you plan on saving it and confirm that they do provide the boxes. If not, you can simply pick one up at any hobby/craft store. I suggest to bride's that they wrap the cake up in saran wrap several times so no air can get into the cake. Place the cake in the box and tape the box shut. I also recommend wrapping the box in saran wrap as well. The key is not to allow any air to reach the cake. Put your cake in the freezer and leave it their until your first anniversary.
Will it taste the same?
If preserved correctly, absolutely! Again, the trick is not to let any air reach the cake. Don't take the cake out of the freezer until the day before you are ready to eat it. When you are ready to thaw your cake simply take it out of the freezer the day before your anniversary and leave it on your counter top, allowing it to thaw naturally. The next day you can unwrap the cake and enjoy!
Can I get a fresh one instead?
Of course you can! Some brides don't like the idea of eating a year old cake. Some plan on moving and the cake would have to thaw and refreeze during the move. I can't speak for all bakers, but for myself, I just ask that you contact me at least 2 weeks before your anniversary and you can order a new, fresh cake just like you had on your wedding day!