DJE,
Unfortunalely, these created backups are incremental backups and not new backups. Incremental backups are added to the current (latest)
Backup Set YYYY-MM-DD HHMMSS folder as a
Backup Files YYYY-MM-DD HHMMSS folder. You will not be able to delete any of the
Backup Files YYYY-MM-DD HHMMSS folders in that specific
Backup Set YYYY-MM-DD HHMMSS folder with destroying the ability to restore that backup set. You can only safely delete
Backup Set YYYY-MM-DD HHMMSS folders through the
Manage space option in Backup and Restore.
For the future if you like to only create new backups (backup set folders), create a backup without it being on a schedule, then you could use the tutorial below to make it easy to create new backups whenever you like.
Backup - Make a "Create New Backup" Shortcut
In addition, you could also use Task Scheduler to run the program (shortcut) on a schedule to create new backups with it.
Task Scheduler - Create New Task