I don't think it's possible, unless you were using Virtal Tape Library, or Robotic Library.
In backup exec, you can modify the job, in the schedule section on the list of exlcusion dates, and configure al the public holidays - and these dates/days, the backup will not run.
If you were wantng to run backups on Tuesday at 9am in this instance, you can manually do this. os check if the BE 2010 can do missed jobs and make up jobs.
I hav emoved on to CA (due to job change0, but BE 11.5 didn't allow to do what you are wanting to acheive.
I think BE2010 will be no different!