Retention 

The retention policy allows you to specify the number of days or number of versions, an incremental recovery point should be retained for the backup job. By setting up the retention policy, the redundant data blocks of the older recovery points are deleted from the backup repository, thereby saving the storage space. If the retention for incremental backup is disabled, all restore points will be retained.

Enable the retention for your incremental backup by toggling the slider to the right. Once enabled you have to select the retention method to retain the restore points. You can choose from the following Retention options.

• Retention for Incremental Backup
• Retention for Deleted (or) Removed VMs