Norton 360 Premier Backup Retention

I've been running Norton 360 for years.  We do backups of several computers with our subscription.  I like the product however I do not like it's inability to set backup retentions for backup sets.  It seems that Norton has simply designed a backup solution that is intended to continually grow vs address backups like the rest of the industry using retentions.  It's alarming that Norton's 'solution' is to create multiple backup sets then delete backup sets to reclaim storage space when needed.  The idea is data protection - not delete entire backup sets to address storage space.  This isn't a 'standard' per the industry and should be rectified.

Please add retention capability to backup sets.