This question already has an answer here:

Where can I determine what apps make the incredible size of backup?

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As you can see there is almost 30GB free space, but I cannot perform a backup because there is not enough space on iCloud. Why?

Using iOS 11, iPhone 6S Plus 128GB

Under Manage Storage > Backup there is following screen:

enter image description here

My question is different to the marked one as duplicated, because:

  • I have 50GB storage on iCloud including 30 gb free space
  • using iOS 11
  • my problem IS NOT about why backup still have 5GB, but why there is no space, even when backup is 20gb (what is rather impossible).

marked as duplicate by Tetsujin, nohillside Dec 11 '17 at 9:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • how many apps on your iphone? Photos and music? – jmh Dec 10 '17 at 23:57
  • @Tetsujin it is not duplicated. Read my explanation. – Bartłomiej Semańczyk Dec 11 '17 at 7:28
  • The answer explaining how to clear your online space & potentially reduce what space is needed is the same. You're looking in the wrong place to check your current storage... General > iPhone storage, not iCloud > Manage. – Tetsujin Dec 11 '17 at 7:34
  • My problem is not related to iphone storage at all – Bartłomiej Semańczyk Dec 11 '17 at 7:36

You can temporarily increase your iCloud storage ($1 per month) and do your backup. You can then check how big the backup is. I noted you have 128GB on your phone. If only a fraction of that is used it could be a lot. After your backup, you can reduce your icloud storage back to 50 GB to end the $1 per month charge.

  • Please, note, that I have already 50GB storage per month and there is 30GB free space;) – Bartłomiej Semańczyk Dec 11 '17 at 7:12
  • Yes, it was the answer;) I needed to upgrade my icloud account to 200 GB, then I was able to see what was the reason af a huge backup, then I downgraded an storage and now it is fine;) – Bartłomiej Semańczyk Dec 27 '17 at 16:58

To determine what is being backed-up to iCloud:

  • From the screen shown in the question, [Settings > Apple ID, iCloud > iCloud]
  • Tap Manage Storage
  • Scroll down to Backup and tap
  • Select the desired device from the list [iPhone]
  • Give the phone time to calculate the sizes of the backups

From there you can see what Apps are backing up data from the largest to the smallest backup size.

  • After manage storage > Backup, there is no list of devices. What should I do now? – Bartłomiej Semańczyk Dec 11 '17 at 7:09

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