How do you backup multiple user's game settings?

I have three users setup on my PS3, and each user has saved game data. How do I backup all of the user's game data? I tried the PS3 Backup Utility, but it overwrites the previously saved user's data. It appears that the structure for saved data is:PS3/SAVEDATA. There are no sub-folders or folders by user. Do I have to save each user to a different external device? What is backup by theSystem Backup Utility? Thanks in advance.

I will answer this my self: the System Backup utilitysaves all the user settings including the saved game stuff for all users. I discovered this after I installed a new 320 Gb HDD. I installed the newdrive; restored the 2.60 Update; reformatted the new drive; and ran the System Restore utility. Each user's setting game settings were restored. I hope this helps someone in the future.