Incremental backups include only the files that have changed since the last full or incremental backup.
Backup Exec provides two incremental backup methods, one that uses archive bit and one that uses modified time to determine if the file was backed up. If you select to use the Full – Back up files – Using archive bit (reset archive bit) and want to run incremental backups, you must use the Incremental – Back up changed files since last full or incremental- Using archive bit (reset archive bit) method. If you select to use the Full – Back up files – Using modified time, you must use the Incremental – Back up changed files since last full or incremental – Using modified time method. The advantages and disadvantages described in this section pertain to either type of differential backup.
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If you use modified time to determine if files have been backed up, the full and incremental backups must use the same backup selection list. |
See About backup methods.