If you put stock in a recent survey from Symantec, the company behind the Norton line of computer protection software, 57 percent of computer users who store personal data on their PCs conscientiously back it up. Those people can feel very good about themselves—the same survey found that a quarter of users have lost data like documents, photos and music files, most commonly when the computer crashes.

But for those feeling good , here is something else to worry about: what happens to those beloved family photos or the extensive music collection if something should happen to your PC and backup? A fire, flood or earthquake could destroy the backup sitting inches from the PC.

For years, big firms have been storing their backed-up data in multiple locations to protect it from disasters. The data of consumers also has value, and it is not always just emotional. It is not hard to accumulate a few hundred dollars’ worth of content that needs protection.

The recognition of the monetary value of data is one force driving the sales of external hard drives. The NPD Group, the market research firm in New York, estimates that the market for external hard drives will grow 33 percent this year. That is largely because devices like the Western Digital My Book, Maxtor OneTouch or the Seagate Pushbutton Backup drives are easier to use and more stylish than past models.

Seagate, the leader of the hard-drive industry, is trying to solve the off-premises backup problem. It is pushing a device from its newly acquired Maxtor unit that allows consumers to back up data at home and off premises. The 500-GB device, called Fusion, allows consumers to link the external drive to the home network so any computer on the network can grab content there.

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