Credit: Justin Duino / Android Authority

By default, Google Photos backups will happen for all the pics and videos you shoot on your smartphone. The quality of those backups can vary depending on your device or personal settings, but you would need to manually turn this feature off for it to stop.

However, there are lots of other pics and videos that come through your device that you might assume Google Photos backups work for, too. As it turns out,

Tap on Library
Tap on Utilities
Tap on Back up device folders
Tap the folder you want backed up
Turn the Back up and sync toggle on
This folder will now back up!

Go to Source
Author: Appster