One of the new feature that’s going to accompany in SQL Server 2016. There is a significant improvement in the hardware sector moving into SSD, flash disk etc which increases the cost of hardware. Holding all the historical or archieve data in to this high performing disks is going to cost you more, assuming you got larger volume of data. As a DBA we don’t want to include this historical data into our backup plan to avoid the backup size. We can choose partial backup but again the tradeoff is in the recovery plan.