Yes, iCloud backs up photos, along with videos, games and social media app data, iPhone calendar and notes, device settings, voice memos, Safari bookmarks, ...
At iCloud.com, you can access your photos, files, and more from any web browser. Changes you make will sync to your iPhone and other devices. iCloud Drive · Contacts · Calendar · Apple Invites
How to Let iCloud Photos Backup iPhone? · 1. Please go to iPhone's Settings > Apple ID > iCloud > Photos. · 2. Enable the Sync this iPhone option to enable ...