OMG! Get your backups in place right now! And, practice running a restore! There are a million blogs & youtube videos showing how. Follow one.
OK, so Google Cloud SQL. I've only experimented with it so far, but it's pretty good. It's the newest of the big three, AWS RDS & Azure SQL and Google Cloud. However, it's got the basics down. You can scale up & down with it. It does have backups enabled for you (you still need to learn how to restore from those backups though, get on that now). Overall, it's solid. If you have a reason to pick it over AWS RDS or Azure SQL, you'll be fine. I'd just be curious why you want that one over the others?