The database backup contains the full set of configs & data needed to restore a grid.
If a single member (that isn't the active gridmaster) is lost, a new physical or virtual appliance can be deployed to replace it. Simply set the LAN1 address (and the MGMT address if used for grid communications), assign licenses, and then join it to the grid. The appliance will download its full configuration, and any services data.
Reporting is slightly different. The appliance config is still in the grid database, but the reporting data is not included with the database. It is backed up and restored using iterative reporting backups. It also gets reporting data restored from the same iterative backup set.
