Many people are not happy about carrying the above with them at all times. They can get lost, then it is real nuisance to get them replaced.
This also goes for car papers - they are to be kept with the vehicle at all times.
Take the above papers to a notary. There is one in the El mar building in Puerto Santiago and another in the new centre in Alcala. The notary will then give you a notarised copy. The cost is around Euros 6 per copy, but worth it. You can leave your originals locked in your safe.
Notarised copies are accepted by the Guardia civil.