Do you keep backups of your fic?

Every time AO3 is down I think about a nightmare scenario where it somehow manages to delete entire fics/accounts. Then I remember that I don’t have backups of my works! Of course I have unfinished versions of some of them in my google docs, but definitely not the full, edited stories. I would be absolutely devastated to lose my stories but I haven’t thought about the best way to keep them safe. Download the epubs? Copy them into g.docs? Or just trust that ao3 will be fine?