Hmmm. How much did it cost to store the Dead Sea Scrolls for 2000 years?
The dead sea scrolls are a digital medium. The scrolls themselves are obviously deteriorated; if they were an analogue recording of some sort you would not be pointing them out as a success story.

I suppose the best way to archivally store visual information would be to digitally record the data in the form of QR codes or something simpler like plain-text image information, onto B&W archival film. Then not only will the film last for hundreds of years, it would be copyable infinitely many times with no generation loss.