Bash script directory detection and creation

I have a bash script that depends on a group of folders existing, but dont want to create the folders by hand every time I use the script on a new machine.

Right now I have the following for directory detection and creation (taken from here):

for i in {7..0}
do
  if [ ! -d "backup.${i}" ]; then
    mkdir backup.${i}
  fi
done

This detects and creates the folders 'backup.0' through 'backup.7' just fine, but there has to be a more elegant way to do this.

---

mkdir -p backup.{0..7}

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