The wedding certificate is indeed very important to assure that your ceremony is registered and valid all over the world. As for every other aspect of the wedding, Europewedding will make this process very simple for you.
From the very ending of the ceremony, you will already be legally married both in Italy, in your home country, and all over the world.
We will however provide you with multiple copies of your wedding certificate, so that you can register it at your local town hall upon your return from the honeymoon.
From experience, we prefere to mail your certificate via express courier to your address of choice, to avoid that you have to travel with such important documents.
Keep in mind that for any need (mortgage, insurance, loss, or any other purpose) you can always ask us in the future for further original copies.