As any content added to your Site Sculptor pages via a CMS would exist only in a database that you have made available, you would need to make backups directly from that. Exporting the database manually from within phpMyAdmin is very easy to do, but it is also easy to forget to do.
You can schedule automatic backups with cron jobs (and some FTP software have a scheduling feature).
If you are passing on the responsibility of backing up the database to your clients, you might like to look at making a backup/scheduler facility in the site admin, - it might be worth looking at these:
phpMySQLAutoBackup
phpJobScheduler
