This section describes what In-file delta technology is and how it can be used to reduce size of backup
[Apply to files (Minimum Size)] defines the smallest file size a file must have before the use and application of In-file delta technology. If the size of a file that is being backed up is smaller than the [Minimum File Size] setting, In-file delta technology will not be applied to this file and the whole file will be uploaded to the backup server. It is not necessary to perform In-file delta backup on small files because backing up the whole file does not take long. Backing up the whole file instead reduces the time required to restore the file.