Click on your Apple ID and choose the iCloud option from the side menu. The iCloud storage will be in front of you. Click on Manage to delete old backups.
2022年11月4日 — Delete iCloud backup: quick guide for iOS · Access Settings · Navigate to “Manage storage” in iCloud · Select and delete backup. When should ...
2023年11月29日 — Open your iPhone settings. Tap on your name> icloud> manage icloud storage> icloud backups. Select the backup you want to remove and tap delete.