This option is effective for incremental and differential disk-level backup.
This option is not effective (always disabled) for volumes formatted with the JFS, ReiserFS3, ReiserFS4, ReFS, or XFS file systems.
The preset is: Enabled.
Incremental or differential backup captures only data changes. To speed up the backup process, the program determines whether a file has changed or not by the file size and the date/time when the file was last modified. Disabling this feature will make the program compare the entire file contents to those stored in the backup.