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The most reliable web hosting services will backup the data on their servers every 24 hours. This of course is necessary in case there is a failure of their hard drives with loss of data. You should always have complete backups of your web site on your own computer in case a major disaster strikes. Most of the so-called free hosting services and some of the cheapest paid hosts do not offer backup services. All reliable paid hosts will offer some kind of data backup.

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