As you know, I am a big believer in backups. I use macOS Time Machine and a couple of third-party Apps to backup my stuff. I also have an online backup at Backblaze. Time Machine is a great way to backup, but having additional backups using a third-party backup App is advised. This article covers several third-party backup Apps and how they work. I have used them all, they all are good in their own way. You should try to use one of them if you can.