In order to enable Periodic Backup you need to enter database settings by pressing Settings on a top navigation panel.
Once there select the "Periodic Backup" option:
By default backup is not configured and disabled. To activate it press Activate Periodic Backup, this will activate the backup settings where you will be able to choose your backup type and configure it properly.
Available backup types:
File System Folder where you will need to specify:
Glacier Vault or S3 Bucket with following configuration options: