Check out the Since You Asked column in Computerworld to read Steve Duplessie's view on DPM. He mentions a stat that I think really pinpoints the need for continuous data protection (CDP): "Eighty percent of all recoveries are for data that is less than seven days old."

DPM doesn't provide CDP, of course, but rather "near-continuous data protection". For an interesting explanation of what is and is not CDP, see The State of CDP by Steve Apiki at internetnews.com.