If you haven't backed up your iPhone to iCloud before or in a long time, the Next Backup Size will be a pretty large amount of data. Obviously, if it's more than 5GB you have either buy more
How to Save Space in Your iCloud Backup (and Avoid Paying Apr 16, 2016 How do I see photos backed up to iCloud? - Apple Community Dec 11, 2012 How to Delete Photos from iCloud in 5 Quick Ways How to Delete Photos from iCloud with AnyTrans for iOS. If you prefer one quick and safe way to …
About backups for iPhone, iPad, and iPod touch - Apple Support
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What does iCloud back up? - Apple Support
Securely back-up your photos and videos to Google Photos and enjoy them from any device. 1. Find the right photos faster . Your photos are automatically organized and searchable so you can easily find the photo you’re looking for. Easily save and share what matters . How to Delete Photos from iPhone to Free Up Storage May 18, 2017