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For a disk or volume to be eligible for incremental-by-date backups, you must first perform a full incremental backup of that entire disk or volume. Running an incremental backup of only a directory branch or individual file will will not make the disk or volume eligible for incremental-by-date backups.
To perform an incremental-by date backup using the GUI, select the Incremental (date only) option from the type of backup pull-down menu or use the incrbydate option with the incremental command.
The client backs up only new and changed files with a modification date later than the date of the last incremental backup stored at the server, unless you exclude the file from backup services. Files added at the client after the last incremental backup, but with a modification date earlier than the last incremental, are not backed up. Tivoli Storage Manager does not back up changes to NTFS security information on Windows NT clients because the changes do not alter the last changed date and time. The directories in the path that contain the file are also backed up, unless they already exist on the server. A directory that already exists on the server is only backed up again if its modification timestamp changes. The files under the directory are also backed up even if their modification timestamps have not changed.
If you run an incremental-by-date backup of the whole file system, the server updates the date and time of the last incremental. If you perform an incremental-by-date backup on only part of a file system, the server does not update the date of the last full incremental. In that case, the next incremental-by-date backup will back up these files again.