Confused with backup pricing

Hi. Today I received and email from Digital Ocean telling me that as from February they will be actually charging for backups (they where saying they would but they didn’t).

On their email they say: "Starting in February, however, you will begin to see charges for backups on your monthly invoice. Backups will now happen on a weekly basis, with at least four backups occurring per month. You’ll only be charged for a maximum of four backups in any given month and you’ll never be charged for backups that fail to happen."

Now, on the community pages I found this link: https://www.digitalocean.com/community/tutorials/understanding-digitalocean-droplet-backups

Which says: “DigitalOcean backups cost 20% the monthly cost of your Droplet. So for a $5 Droplet, DigitalOcean backups will cost $1, bringing your monthly total to $6.”

I’m a bit confused. If I have a $5 Droplet will I be charged $6 a month or $9 a month (if no backup fails)?

Thank you!