The History Settings The (Web hosts) first of these screens,

The History Settings The first of these screens, History Settings, allows you to specify how the history facility behaves. The first item, the Enable file history radio buttons, gives you the option of disabling history altogether. While this may conserve some space in the database, it will remove the safety net provided by the ability to revert to a previous version. The second item, the Number of stored file versions field, allows you to specify how many older versions of the file ought to be retained. You will only be able to revert back to these versions. By default, this value is set to 10, meaning only the ten most recent versions of the document will be retained in the history database. Usually, this is sufficient. A history entry is created each time a resource is published, not each time a resource is edited. If the default value is set to 10, then the last ten published versions of the file will be saved. Clicking Ok will save and apply the changes and return you to the File History screen. Clearing the History Clicking the Clear History button in the File History screen loads a screen that provides a way to selectively remove history information from OpenCms:
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