Even the most reliable computer is apt to break down eventually. Many professionals recommend that you make two, or even three, backups of all your files. To be especially safe, you should keep one backup in a different location from the others.
You can back up files using operating system commands, or you can buy a special-purpose backup utility. Backup programs often compress the data so that backups require fewer disks.
(n.) (1) The act of backing up.
(2) A substitute or alternative. The term backup usually refers to a disk or tape that contains a copy of data.
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