How to buy more storage on iPhone for more data backup?

Go to Settings → [your name] → iCloud → Manage Storage → Buy More Storage. Pick a plan, confirm payment, and it upgrades your iCloud instantly for backups.
 
To increase the iPhone storage to make a backup, tap Settings)[your name] iCloud Manage Account Storage Buy More Storage or Upgrade to iCloud+. Select a plan (50GB, 200GB, or 2TB), sign-in using your Apple ID, and your iCloud storage is extended immediately to back up files.
 
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