Can't back up to PC
Hi. I can't seem to back up my iPhone to my pc using iTunes. The "back up now" button just greyed out. My iTunes (12.12.2) and iPhones (iOS 15.3) already up-to-date.
iPhone 12, iOS 15
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Once iTunes sees the device it should perform a backup immediately. The top Now Playing window in iTunes shows the progress of actions involving the iPhone and Sync. Be quick and you should see a message telling you that it's performing the backup. Once it has backed up, then iTunes does the Sync and the message will tell you which part of the Sync it's working on. Once it's done the backup, the button will remain greyed out since there's nothing new to be backed up.
If you tap on iTunes' top bar menu item Edit/Preferences>Devices > Device backups: you should see information about the time of the last backup, even if the phone is not currently connected to iTunes.