Even if you don’t have a computer, you can still backup iPad to an external drive. For this, you need to use a USB-to-lightning adapter so that you can easily connect your external hard drive directly to your iPad. Later, you can move your data (like your photos) from your iPad to your external hard drive. Here’s how to backup iPad photos to an external hard drive without a computer.

    Step 1: Connect your hard drive to your iPad (or flashdrive) using the lighting adapter (ask I.T.)

You will be notified once your external drive is detected by your iPad. You can also go to the Files app (or any other File Explorer) on your iPad and view the connected external storage. 

Step 2: Copy your data from iPad to your external drive

As the Files app would be launched, you can select the location of the connected external drive and save your photos here.