Yes, you can delete backups on iCloud. To do so, open the iCloud settings and select the “Backups” tab. Under “Delete backups,” select the “Delete all backups” option.
The short answer is no—deleting your old iPhone backup from iCloud will not affect any of the data on your actual iPhone. In fact, even deleting the backup of your current iPhone will have little impact to what is currently on this device.
When iCloud backup is turned on your new iPhone or iPad will reset automatically and you don’t have to set it up from scratch.
Deleting an old iCloud backup (when you have a current iPhone in your possession) has no impact on what’s actually on your device.
