This is an old revision of the document!
The ChastiKey server and database(s) are backed up frequently in the following different places:
A weekly complete server backup offered by the hosting company. Not held on the server.
A daily complete server backup saved in an Amazon S3 bucket. The frequency of this may change to keep it within a free or cheap tier.
A daily save of the SQL databases saved on the server. And only ever the last 7 days of backups.