When backing up an iPhone, there are three main options: iCloud, a Mac, or a PC. Each method has its advantages, but if you select the wrong backup during a restore, it may not work correctly.
Here’s a breakdown of what could happen:
- iCloud Backup: If you use iCloud to back up your iPhone, it happens wirelessly and is linked to your Apple ID. When restoring from iCloud, you need to ensure you select the correct backup that corresponds to the device you're restoring. If you choose the wrong iCloud backup—like one made on a different device or a previous version of the phone—you may face issues, and the restore might not include all your data or settings.
- Mac or PC Backup: If you back up to a Mac or PC using Finder (macOS Catalina and later) or iTunes (macOS Mojave and earlier, or Windows PCs), the backup is stored locally on your computer. When restoring, you need to select the correct backup from the list that matches the device and time frame you want to restore from. Using the wrong backup file can lead to missing data or settings.
If you're restoring a backup and after 10 minutes or so you get a message that the backup is "too big," it's an indication that the backup you've selected doesn't match your device's specifications, like size or iOS version. In this case, you'll need to make sure you’ve selected the correct one. If the restore fails, trying a different backup that aligns more closely with your device's specifications might solve the issue.

See this --> If you see an error when you update or restore your iPhone, iPad or iPod - Apple Support (IN)
Or this --> iOS update and restore errors - Apple Support
Error 53 --> If you see error 53 when you update or restore your iPhone or ...
Error 9, 4005, 4013, 4014 --> If you see error 9, 4005, 4013, or 4014 when you restore your ...

VPN or proxy connections might prevent your device from contacting the update servers.
