Is there a way to backup Astaro's configuration automatically to something other than e-mail? A remote NFS share would be nice, but I can't find documentation on it.
On Version 7, the ASG will keep a configurable amount of backups on disk so you can restore to an earlier system state. It is currently not possible to automatically store backups on shares or anything besides local disk or e-mail accounts.
Those snapshots are not equivalent to a backup file. Backups which are sent via Mail are generated on the fly, and they can be imported again. Configuration snapshots are stored on the local disk, and they are not supposed to be copied away (because copying away implies copying them back there sometime, or on another machine, a ton of stuff might happen in between, and we just don't want to support that).
You can always contact presales and arrange a custom-made solution for you if you really have the need for that.