In reply to Darryl.

Darryl, the problem with BackupBuddy is that it fails on larger sites and not particularly gracefully (i.e. you might think that you have a working backup and you don't). In general, iThemes software has not been at all reliable for us (we were clients there for over three years and desperately wanted BackupBuddy and Sync to work for example). iThemes pricing is very competitive but iThemes software is much less reliable than dedicated development studios (with one or two products).

You're right about the numbers on VaultPress for a web development studio, paying for the backups itself. In this case, you probably want to be using a cross-host Wordpress management suite like ManageWP (service), MainWP or InfiniteWP (self-hosted). All of these offer great backup, cloning and migration tools for $1/month per site or less.