Since the software no longer requires the archive bit to track whether or not a file needs to be backed up, it is strongly recommended you do not use it.
Explanation
Some types of backup software modify a file attribute known as the archive bit to communicate, in future scans, whether a file needs to be backed up.
Using the archive bit is a legacy feature in the IBU software and was used when multiple backup solutions were installed on the same machine, backing up the same data.