IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive ...

screen on the backup window, or use the incremental command in the commandline interface. Specify file systems, directory trees, or individual files to include inthe backup.||||||||||||||||||||During an incremental backup, the client queries the server or the journal databaseto determine the exact state of your files since the last incremental backup. Theclient uses this information to:v Back up new filesv Back up files whose contents changed since the last backup. The client considersa file changed if any of the following attributes changed since the last backup:– File size– Date or time of last modification– Access Control ListIf only the following items change, they are updated without causing the entirefile to be backed up to the server:– File owner– File permissions– Last access time– InodeInode updates are ignored for files stored on an IBM TotalStorage SAN FileSystem.– Group IDv Expire backup versions of files on the server that do not have correspondingfiles on the workstation. The result is that files which no longer exist on yourworkstation will not have active backup versions on the server. However,inactive versions will be retained according to rules defined by the Tivoli StorageManager administrator.v Rebind backup versions if management class assignments change. Only objectsthat have active backup versions are rebound. Objects for which only inactivebackup versions exist are not rebound.Attention: Each directory is also backed up under the following circumstances:v It has not been backed up previouslyv Its permissions have changed since the last backupv Its Access Control List has changed since the last backupv Its Extended Attributes have changed since the last backupv Its time stamp has changed since the last backupYou can use the preservelastaccessdate option during a backup or archiveoperation to specify whether to reset the last access date to its original valuefollowing a backup or archive operation. By default, the Tivoli Storage Managerclient will not reset the last access date of any backed up or archived files to theiroriginal value prior to the backup or archive operation. See“Preservelastaccessdate” on page 316 for more information.Directories are counted in the number of objects backed up. To exclude directoriesand their contents from backup, use the exclude.dir option. For more aboutexclude.dir, see “Exclude options” on page 246.Understanding which files are backed upWhen you request a backup, Tivoli Storage Manager backs up a file if all of thefollowing requirements are met:88 IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive Clients Installation and User’s Guide