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Cobian Backup uses the archive bit of the attributes to check if the file has been changed or not. Sometimes the program fails to change the attribute and the file will be copied again next time even if it is not necessary. The archive attribute operation can fail for example if your source is in a Linux or other system that have different attribute formats or if the engine doesn't have permission to change the attribute. This setting works in the same way as incremental but instead compares the files from the last Full backup. If the current files are different compared to the last Full backup it will back up that file.This is the feature you will most likely be using after creating your first backup instance. It checks if the source has changed from the last backup and only will backup those files that are new or have changed since the last backup. This saves a lot of time and space on your PC or the medium you will store your backup upon.