Make a Baseline Backup Before You Go Online
You should make a permanent “baseline” backup of your computer before you connect with the Internet for the first time so that you know it doesn’t have any virus infections. Make this backup onto a removable disk or tape that can be kept separate from your computer, and keep this backup permanently. You can use it as a starting point for recovery if your system is compromised.
To learn more about making backups, see “Creating a System Image Backup,” p. 770.
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