Update concepts-backup-restore.md

Update RPO

Author: kabharati

articles/postgresql/flexible-server/concepts-backup-restore.md

@@ -32,7 +32,7 @@ These backup files can't be exported or used to create servers outside Azure Dat
 
 Backups on Azure Database for PostgreSQL flexible server instances are snapshot based. The first snapshot backup is scheduled immediately after a server is created. Snapshot backups are currently taken once daily. If none of the databases in the server receive any further modifications after the last snapshot backup is taken, snapshot backups are suspended until new modifications are made in any of the databases, point at which a new snapshot is immediately taken. **The first snapshot is a full backup and consecutive snapshots are differential backups.**
 
-Transaction log backups happen at varied frequencies, depending on the workload and when the WAL file is filled and ready to be archived. In general, the delay (recovery point objective, or RPO) can be up to 15 minutes.
+Transaction log backups happen at varied frequencies, depending on the workload and when the WAL file is filled and ready to be archived. In general, the delay (recovery point objective, or RPO) can be up to 5 minutes.
 
 ## Backup redundancy options