Having backups on DO block storage is much less risky than having your images there. Has that been working for you? If so, it’d be helpful to know, as you may be the person with the most experience.
But wait! Now it looks like there’s a better solution for backups developed and tested by a Discourse @team member:
https://meta.discourse.org/t/discourse-backups-to-dropbox/51176?u=pfaffman