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Installation and User's Guide

Installation and User's Guide

Installation and User's Guide

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Copy frequency attributeThe copy frequency attribute is the minimum number of days that must elapsebetween successive incremental backups. Use this attribute during a fullincremental backup.Copy frequency works with the mode parameter. For example, if frequency is zero (0)<strong>and</strong> mode is modified, a file or directory is backed up only if it changed since thelast incremental backup. If frequency is zero (0) <strong>and</strong> mode is absolute, a file isbacked up every time you run an incremental backup against it. This attribute isnot checked for selective backups.For archive copy groups, copy frequency is always CMD (comm<strong>and</strong>). There is norestriction on how often you archive a file.Copy frequency is ignored during a journal-based backup.Journal-based incremental backup differs from the traditional full incrementalbackup because Tivoli Storage Manager does not enforce non-default copyfrequencies (other than 0).Versions data exists attributeThe versions data exists attribute specifies the maximum number of different backupversions retained for files <strong>and</strong> directories.If you select a management class that permits more than one backup version, themost recent version is called the active version. All other versions are called inactiveversions. If the maximum number of versions permitted is five, <strong>and</strong> you run abackup that creates a sixth version, the oldest version is deleted from serverstorage.Versions data deleted attributeThe versions data deleted attribute specifies the maximum number of differentbackup versions retained for files <strong>and</strong> directories that you deleted.This parameter is ignored until you delete the file or directory.If you delete the file or directory, the next time you run an incremental backup, theactive backup version is changed to inactive. Tivoli Storage Manager deletes theoldest versions in excess of the number specified by this parameter.The expiration date for the remaining versions is based on the retain extra versions<strong>and</strong> retain only version parameters.Retain extra versions attributeThe retain extra versions attribute specifies how many days all but the most recentbackup version is retained.The most recent version is the active version, <strong>and</strong> active versions are never erased.If Nolimit is specified, then extra versions are kept until the number of backupversions exceeds the versions data exists or versions data deleted parameter settings. Inthis case, the oldest extra version is deleted immediately.238 IBM Tivoli Storage Manager for Windows Backup-Archive Clients: <strong>Installation</strong> <strong>and</strong> <strong>User's</strong> <strong>Guide</strong>

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