How to automatic backups work with block storage volumes? Are they included in backups of the Droplet they're attached to, or do they get backed up on their own? And if they get backed up, how does the pricing work?
Backups of Block Storage is not available for now.
Block Storage volumes are High Available and Redundant - it reduces chance of data loss in case of hardware failure.
This is quote from Announcement - Block Storage: ...