Thanks for your assistance.
I just setup two new jobs, one to do a full backup every Friday, and the other doing incrementals M-Th.
I'm checking out the forum for issues regarding Exchange. In the meantime, I've configured the handling of Exchange as follows:
Exchange server backup method: Full-Database & Logs (flush committed logs)
Mailbox backup method: Full-Back up messages - reset archive bit
What do you think?