Yes, it must be plugged in.
See this guide: How to back up your iPhone, iPad, and iPod touch - Apple Support
section:
Automatically back up with iCloud Backup
Regards
Giulio
Apple Event: May 7th at 7 am PT
Yes, it must be plugged in.
See this guide: How to back up your iPhone, iPad, and iPod touch - Apple Support
section:
Automatically back up with iCloud Backup
Regards
Giulio
Yes, it must be plugged in.
See this guide: How to back up your iPhone, iPad, and iPod touch - Apple Support
section:
Automatically back up with iCloud Backup
Regards
Giulio
why wont my iphone8plus not backup when wirelessly charging, locked, and on wifi?