Resume job not starting

NBU 7.5.0.6 (client and master/media)

master/media  2008 R2

I backup to disk and then vault to tape. My disk ran out of space and a couple of jobs were suspended. I cleared my disk and right clicked and the jobs and selected resume. They jobs do not start. i do not want to restart the jobs from the beginning as they take along time to complete. Looking at the details tab the jobs are about 70% complete. Whay can I do to restart the jobs from where they stopped? Thanks