I'm running Backup & Recovery 17 Free using a backup strategy of "Chain of full and incremental backups"; Number of increments until next full = 6; Use backup retention (checked); keep backup chains = "By number of chains"; Number of backup chains to keep = 2.

I'm only 8 weeks into using this product and twice my backup has failed with the destination drive full. The cause each time due to old backup chains not automatically deleting. The best I can tell is the product has never deleted an older backup chain. Does this really work or do I need to resort to an external solution?