The Signal is the blog for the digital preservationists working at the Library of Congress. It's fun and informative for genealogists. Recently they published a two-part post on Family History and Digital Presenvation:
Amassing a collection of digital files raises the issue of how to store and preserve that collection. Digital genealogy could result in a heap of text files (such as GEDCom files), image scans (most sites enable you to save an image in either JPEG, TIFF or PDF formats), audio files and video files. It’s best to follow the Library of Congress’s personal archiving advice, which is basically to: 1) organize everything within one collection folder, 2) backup your collection onto several storage media in several different places and 3) migrate your collection every five years or so to new storage media.