A better way to say it is:

"Four times per hour, every hour on the 6th minute, the 21st minute, the 36th minute and 51st minute."

If I'm not mistaken, media temple just wants to back up 4 times per hour and to keep from getting slammed at the quarters, they randomize a bit the defaults they hand out.

Thanks for the explanation I'll add it to the post. Although I still feel like a bone head for thinking it was 11 years.

No problem. Don't feel like a bonehead for learning. Its a well worn path we all take.

I most certainly have you beat in the bonehead department... some of the tragic things I've done with grep because I didn't know about sed...

Lol, Thanks again, I've added your comments to my post.