Set Backup number lower than 100

Hi,

100 backups per site are consuming a massive amount of storage, and there is no way to delete some of them. We can only delete all of them. Leaving us vulnerable if something were to happen.

I would like to be able to set the number of stored backups to be less than 100. Like, 10, 25, 50, and then 100+

Would also be great to selectively delete old backups, but that was mentioned in another post: 'Partially Delete Backups'

Thanks