All couples marrying civilly in Italy receive an international wedding certificate valid in their home country. To register your marriage at home you will simply need to go to the registrar with the certificate and present the document.
Only a single wedding certificate is usually issued by the Italian authorities, but additional ones can be requested, as long as this is done in advance.
Additional copies can be hard to obtain after you leave the country. Please advise us beforehand how many copies you would like to have.