Folder Exclusions in Backup Tasks Not Working

I want to exclude several folders containing large video files from being backed up. I have created a "Backup Task" for a "Disk and Partition Backup." Under "Optional steps," I clicked on "What to exclude" to select the folders that I want to exclude from being backed up. I checked the box for "Exclude files matching the following criteria." I then clicked "Add" and added exclusion parameters that looked like the following:
c:\videos\media folders\*.*
c:\videos\project files\*.*
etc.

I tweaked other options and settings, and then initiated the task. After it completed the 8 hour backup task, I check in the morning to find that none of the specified folders were excluded. In other words, all of the folders that did not want backed up were backed up anyway. On a previous backup attempt I tried setting the exclusion parameters a little differently:
c:\videos\media folders\
c:\videos\project files\
etc.

This also did not work. It is essential, given my lack of back up space, that I exclude these folders. Any suggestions?

My Specs:
ATI Home 2010 (latest build with Plus Pack installed)
Windows 7 x64 Ultimate