iCloud Photo Backup How To

[GraemeS]

It is possible but not great imo, see this answer:

Do your trust your Photos only in iCloud with no local copy/backup?

I’ve never had any issues with iCloud Photo Library, but I still follow Apple’s advice (from its Set up and use iCloud Photos page) and back up my library elsewhere: Back up your photos and videos When you turn on iCloud Photos, your photos and videos automatically upload to iCloud. They’re not duplicated in your iCloud backup, so you should keep backup copies of your library.