Adding cost statement (#3326)

docs/components/concepts/backups.md

@@ -33,7 +33,7 @@ When you create a cluster in Camunda 8 SaaS, you must specify a region for that
 You also need to specify where the backups for that cluster will be located:
 
 - By default, the backups will be located in the same region as the cluster.
-- For disaster recovery reasons, you can select a "dual region" backup location. Backups will be automatically replicated in the secondary region to give you better protection in case the primary region experiences disruption.
+- For disaster recovery reasons, you can select a "dual region" backup location. Backups will be automatically replicated in the secondary region to give you better protection in case the primary region experiences disruption. Dual region backup is offered at no additional cost.
 
 #### Backup limits and rate limits