I would question why you'd want to run them in parallel if you are writing them all to the same drive, especially if all the databases are located on the same drive. You are adding extra IO Load to the whole system. I'd be more inclined to let them run sequentially to spread the IO load out over time. I might consider running them in parallel if I was writing each backup to separate locations.
Jack Corbett
Consultant - Straight Path Solutions
Check out these links on how to get faster and more accurate answers:
Forum Etiquette: How to post data/code on a forum to get the best help
Need an Answer? Actually, No ... You Need a Question