Backing up all of your photos somewhere online is a good idea. Phones get lost or broken, SD cards can go bad, and sometimes a picture is a priceless memory. We think you should be using any of the various services to keep everything stored in the cloud in case you ever need access to a remote backup.
Google Photos is one way to do just that. You can read all about the pros and cons of using it, but it’s also important to know where the settings for the backup service are.