Esteve Boix , Aug 06, 2006; 05:20 p.m.
Digital files don't degrade over time.
If you don't backup them properly, you may simply loose the files, but the copy will always be like the original.
Another question is the print. It depends on the quality of the paper, the ink, etc... Usually prints made with your own printer don't last long.
PD: Never use a print as a backup. Store them properly on CD/DVD/HardDrive/Whatever.