clarifying that DBMS privileges do not get backed up (#1501)

modules/ROOT/pages/backup-restore/online-backup.adoc

@@ -156,7 +156,15 @@ With a single `*` as a value, you can back up all the databases of the DBMS.
 - `all` - include both `roles` and `users`.
 The metadata script can be found in the backup directory `<database>/tools/metadata_script.cypher`.
 [NOTE]
-`roles` and `users` that do not have database-related privileges are not included in the backup (e.g. those with only DBMS or no privileges). It is recommended to use `SHOW USERS` and `SHOW ROLES` to get the complete list of users and roles in these situations.
+====
+Privileges specific to the DBMS and not to the backed-up database are not included in the backup.
+For instance, `GRANT ROLE MANAGEMENT ON DBMS TO $role` will not be backed up.
+
+Accordingly, `roles` and `users` that do not have database-related privileges are not included in the backup (e.g. those with only DBMS or no privileges).
+
+It is recommended to use `SHOW USERS`, `SHOW ROLES`, and `SHOW ROLE $role PRIVILEGES AS COMMANDS` to get the complete list of users, roles and privileges in these situations.
+====
+|all
 
 | --prepare-restore
 | true