Why can’t I install the iOS update?
It says update is available when iPhone is backed up. I can’t get my phone to completely back up. What do I need to do?
[Re-Titled by Moderator]
iPhone SE, iOS 16
Your issue is not very clear. Backing up and Software update are 2 separate processes, not related to each other.
You can backup without updating, and you can update without backing up.
What exactly is saying there's a software update?
If you are trying to backup to a computer and it pops up a software update message, that's just a firmware update for the computer to connect to your phone. Do the software update, and then you can back up the iPhone.