While all online backup companies support Windows, not all support Mac. Take a deep breath. All industry leaders support Mac users however we were surprised, even shocked, to learn that some don’t (MiMedia is a fairly decent sized online backup brand that does not support Mac). The other brands that do not work with Mac computers are Acronis, BullGuard Backup, Comodo Backup, Dell Datasafe, Fabrik Ultimate Backup, GFI Software, Handy Backup, KeepVault, UpdateStar Online Backup and Zmanda Cloud Backup. Other than that, all other brands support Mac users.