Backup
My phone won’t back up. It’s fully charged, connected to fast speed wifi, I reset all settings like it says to do online. I have enough space for it and it still won’t do it.
iPhone XS Max
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If you can't back up to iCloud or restore from iCloud backup failed - Apple Support
Make sure you have enogh space in iCloud.¨¨If a message says that your last backup couldn't be completed
Then try:
- Check that you're connected to Wi-Fi.
- Ensure your device is up to date.
- Try to back up on another Wi-Fi network.
- If you still need help, contact Apple Support.
I addition to this as a temporary way to backup, you can backup with iTunes until you get it to work.
How to back up your iPhone, iPad, and iPod touch - Apple Support
