For Windows 2000 or later systems, you can enhance incremental and differential backup performance by selecting to have Backup Exec use the information recorded in the NTFS Change Journal. NTFS logs all file system changes in the Change Journal. If you select to use the Change Journal and select Differential – Using modified time or Incremental – Using modified time as the backup method, Backup Exec will scan the journal to get a list of changed files rather than scan all files, reducing the amount of time required to perform the incremental or differential backup.