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File backup is very important. If a site is backed up properly and crashes, no information is lost; improperly, and the customer’s loss could be catastrophic.
Backup services vary from cheap and simple to expensive and complex, and this variation usually depends on the frequency of backups made. Whereas a simple, static site will only need to be backed up every so often, high-end, high-traffic business sites often require real-time backup, so if the site goes down, the site may only lose a split-second of information.
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