In my case, The rollback feature bricked its onw disk because on a 30g system partition, an install with a separate home partition (not included in the backups) will drown itself in factory settings backups.
It’s a great feature. Give it ample space and trim down on the all the snapshots afterwards.
It’s too good not to be posted here :
Be sure to click the link to a fuller version provided beneath this one. Eco is just excellent.