Installation and User's Guide

Manager client will not reset the last access date of any backed up or archived filesto their original value prior to the backup or archive operation.Directories are counted in the number of objects backed up. To exclude directoriesand their contents from backup, use the exclude.dir option.Related conceptsChapter 9, “Storage management policies,” on page 235Related reference“Exclude options” on page 366“Preservelastaccessdate” on page 432Journal-based backupJournal-based backup is an alternate method of backup that uses a change journalmaintained by the Tivoli Storage Manager journal service process.Journal-based backup is supported for all Windows clients.To support journal-based backup, you must configure the journal engine serviceusing the dsmcutil command or the client GUI setup wizard.A backup for a particular file system will be journal-based when the Tivoli StorageManager journal service has been installed and configured to journal the particularfile system, and a valid journal has been established for the file system.The primary difference between traditional incremental backup and journal-basedbackup is the method used for backup and expiration candidates.Traditional incremental backup obtains the list of backup and expiration candidatesby building comprehensive lists of local objects, and lists of active server objectsfor the file system being backed up. The local lists are obtained by scanning theentire local file system. The server list is obtained by querying the entire serverinventory for all active objects.The two lists are compared, and candidates are selected according to the followingcriteria:vvAn object is selected as a backup candidate if it exists in the local list. butdoesn't exist in the server list. The object is also a backup candidate if it exists inboth lists, but differs according to Tivoli Storage Manager incremental criteria(for example, attribute changes, date and size changes).An object is selected as an expiration candidate if it exists in the server list, butdoesn't exist in the local list.Journal-based backup obtains the candidates list of objects to backup and expire byquerying the Tivoli Storage Manager journal service for the contents of the changejournal of the file system being backed up.Change journal entries are cleared (marked as free) after they have been processedby the backup client and committed on the Tivoli Storage Manager server.Journal-based backup is activated by configuring the journal service to monitorspecified file systems for change activity.Journal-based backup is enabled by successfully completing a full incrementalbackup.114 IBM Tivoli Storage Manager for Windows Backup-Archive Clients: Installation and User's Guide