Since you have delegated a part of your database to the remote Azure instance, when you perform a database backup, only local and eligible data will be backed up; remote data is the responsibility of the Azure service. By default, Azure automatically creates storage snapshots at least every 8 hours and retains them for seven days so that you can restore data to a point in time (by default, 21 points). You can change this behavior and increase the number of hours or backup frequency by using the system stored procedure sys.sp_rda_set_rpo_duration. Since the Azure service is not free, this can have additional costs.
As expected, to remotely restore a database you have to log in to the Azure ...
