SharePoint 2007 split a content database

I want to be able to split the content database in SharePoint (MOSS) for backup purposes much the same as you can do with Exchange data stores.

I was aware of file share/backup bloat that was caused by several of my clients dumping the contents of their digital cameras to their servers while preparing quotes etc.

Here is a link to a TechNet Article explaining how to split a content database.

Move site collections to a new database (split a content database) (Office SharePoint Server 2007)

It is part of the larger:

Add, split, and merge content databases