I've used Google Photos since I joined this forum. I love the service and it keeps getting better. It's free with paid tiers if you need more storage space. It's very reasonably priced. I'm using a Google Pixel XL phone, have been since its release, and Google gives you unlimited Google Photos backups for life for anything uploaded to your account from your Pixel phone.
A lot of people have iPhones, but iCloud's photo services aren't forum friendly. Google Photos is on the AppStore and will back up your Camera Roll for you. It's easy mode. Google Photos all the way.