Although any backup is better than no backup at all, Time Machine may not protect your data to the extent or in the way that you need. A few significant weaknesses offset its impressive strengths.
Time Machine copies the files on your computer to a destination you designate—an external hard drive, a second drive inside your Mac, an extra partition on your internal hard disk, a network server, or Apple's new Time Capsule device. Then, once an hour, the program runs again, updating your backup to include whatever files have changed since last time.
READ THE REST OF THE ARTICLE AT http://www.macworld.com/article/132118/2008/02/timemachine1.html?lsrc=mwweek
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