An archive is a collection of historical records, as well as the place they are located.
How many archive do you have?
Physical: book shelves, photo album, storage boxes…
Digital: computer hard drive, USB Flash drive, email, iPod, phone, digital camera, tape recorder, iTune Library…
Archive is changing forms. Books in libraries are scanned and published online. Hence public and access some limited or original copy which was stored in State Archive. The physical boundary seems vanished.
One advantage of digitize data: easy to transfer from one archive to another. For example, to convert a DVD movie into your iPod. So you could enjoy the movie when commute to work. Another benefit is easy to copy and maintain the same quality. For example, photographs. In analog film photos, the way to copy the negative film is to take a photo of that film. Or to enlarge the negative. However, the chemical, paper and time may not identical. Hence the final print may have some different. In contrast, digital photos can save at the same time in two different cards. More the photos send worldwide through WiFi or 3G network for instant publishing.
Sometimes we look back to the same date years ago. Like the Guardian, on 30th March, 2011, a news article originally published in 30th March 1979, is also post on web. It is about the three-mile-Island nuclear accident in USA. The accident echoed the Japanese Nuclear accident.