Can’t Back Up iPhone to iCloud
The Problem: Your iPhone won’t backup its data to the iCloud
The Fix: The first thing to do is check whether your iCloud storage limit is full. If it is, you might have to stop backing up or delete some data – photos typically take up a lot of room, and there might be some you don’t need, otherwise, games tend to backup data, as does the Mail app.
If you can’t trim your backup needs sufficiently, it might be worth upgrading your storage plan. For 99 cents a month, you can 50GB’s worth of iCloud storage – ten times the free amount. This small expense is genuinely worth it, and you’re unlikely to fill it up.
Before trying anything else, check if there’s an iOS update available. If that still doesn’t work, try resetting the network settings (this will reset wifi networks and passwords, as well as cellular and VPN settings) to do this, go to Settings > General > Reset (at the bottom of the page) > Reset Network Settings.
If this doesn’t work, try backing it up with iTunes, then deleting your old iCloud backup and then trying the backup again.
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