With the introduction of iCloud, Apple has made our lives much easier when it comes to managing content on our iPhones, iPads, and iPod touch. You no longer need a desktop machine to manage your data as everything can be done directly from the device.
iCloud comes at a price though. Even if the first 5GB are free, you probably will go over this allocated storage, especially if you have several iOS devices, and will be required to pay an annual fee for increased storage. To prevent this, it might be a good idea to delete old iPhone or iPad backups from iCloud.
Another reason why you’d want to delete an old iPhone backup from iCloud is if you know it contains a corrupted file. While this rarely happens and isn’t particularly easy to diagnose, I’ve encountered this situation before, and I believe my only option was to delete the corrupted backup.