And what a shame iCloud's included storage is. One device's backups can dangerously close to 5gb without trying, and any additional device backups will easily push you over 5gb, effectively forcing you into the $1/mo storage plan or $4/mo if you want to share 200gb total with your family.
That's exactly what happened to my mother, she owns an iPad and an iPhone and she's constantly being squeezed for money because her two devices' backups max out her storage. She rarely takes photos and doesn't upload anything to iCloud drive, it's just her backups.