The first alternative we’re going to use here is another Apple’s program, iTunes.
Step 1 Open iTunes and connect the iPhone to your PC via a USB cable. Then the device is detected, just click the phone icon to enter the device syncing panel.
Step 2 Then Trust This Computer on your iPhone if it is the first time that you connect your iPhone to this computer and follow the onscreen steps.
Step 3 Click on Summary, then click Back Up Now to back up your iPhone with iTunes.
Disadvantages of Backing up iPhone with iTunes
When backing up an iPhone with iTunes, you don't face quite the same space limitations like iCloud has. However:
You can’t decide the size of your iTunes backup file as iTunes will just back up everything from your iPhone, including files, apps, app data, and system settings.
You’re not allowed to preview any file before you restore this iTunes backup file. As a result, all the data will be restored to the phone and it will cover all the current content of the iPhone. And the cover is irreversible.
To be clear, iTunes is not a perfect choice to back up your iPhone unless you use some professional iTunes backup extractor to restore certain data only.