Backblaze has opened its $5-per-month backup service to Macs, touting simplicity and automatic support for external hard drives. The service is said to use military-grade encryption, and offer emergency overnight back-ups on USB hard drives or DVDs. In a field crowded with competitors such as Mozy, Carbonite and iDrive, Backblaze is banking on its "effortless" client, which backs up critical file
