If I'm mirroring my SSD to my hard drive, do I need an external drive for backup too?

Episode 947 (1:03:42)

Neil from Phoenix, AZ
hard drive

Neil has Windows 8 and is using Storage Spaces with his SSD and hard drive. He's mirroring the data for backup, and is wondering if he still needs an external backup drive. Leo says no, he's already backing up that data with the mirroring option. He can get another backup if he wants, but he should be ok since he's also using Carbonite to backup off site.

(Disclaimer: Carbonite is a sponsor).