Importance

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Abstract

The variable-level backup scheduling method employs a schedule in which backups are performed at set times but the level of backup performed is determined from the condition of the system at the time of backup. Under this method, user-supplied parameters stored in level-tables allow a determination of the appropriate level of backup to be performed. If the data in the scheduled level of backup has not been modified in a sufficient amount under the supplied parameters, then the backup scheduling method determines whether a specified higher level backup is appropriate. If the evaluation of the higher level backup results in a determination that not enough data has been modified, the next level is evaluated. This process continues until the criteria for backup have been met or the level that has been predetermined to be the least amount of data to be saved has been reached.

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