Making exact copies of a digital image is as simple as ‘Ctrl-C – Ctrl-V’, and can be done even by your kindergarten kid. So is sharing the images with your friends and relatives all over the world. But this, I’d say, has nothing to do with digital photography, it's rather ‘digital finishing’. Images shot with a film camera and scanned using a scanner gives me the same convenience.
But making backup copies of digital files is easy and quality of the backups are just the same as the original. Backups of films are simply not possible and if done, give inferior quality.