Dropbox is a cloud storage service where your photos and videos are uploaded automatically as you take them. And they will remain stored online. You can use Dropbox mobile app to view your photos and videos on your mobile and the desktop app to see them on your computer. Both the apps i.e. Dropbox mobile app and Dropbox desktop app easily pull your photos over to local storage or an external hard drive. When you run the app for the first time, you will be prompted to set up how and when to backup your android phone photos.
Here are the pros and cons of using Dropbox for your Android photo backup: