The Snapshot Scheduler is only for Exchange, SQL and in 5.1 SP1, SharePoint. To perform scheduled snapshots, without NetBackup using the Advanced Client, you would need to create a script and execute this on a schedule. A lot of people use scripts for offhost backup of the data as they may not own NetBackup as their primary backup application which is currently the only application that can schedule the snapshots of regular volumes and perform the necessary disk group splits and disk groups joins that are required to refresh the data.
I hope that this helps,
Daniel