Google Photos backup support was removed 31st March 2025 as Google removed API access
If you are using SyncBackPro V9.1.12.0 or newer then you can use SyncBackPro to backup your Google Photos. Simply create a new backup profile and choose Google Photos as your source. Older versions of SyncBack relied on access to Google Photos via Google Drive. However, Google stopped this method from working in July 2019.