The stories of the miracles of Jesus have allegedly survived 2000 years through written records by multiple witnesses. These records were compiled into a collection called "The Bible", which has been reproduced more than any other book on the planet. Early reproduction theoretically makes modification less possible, as any discrepancies would stand out when compared to other reproductions.
Today however, 2000 years later, many people don't believe that the miracles ever happened.
If Jesus performed miracles today, how could we more convincingly document them so that a society 2000 years from now would believe that they actually happened?