Backblaze supports and has clients for these operating systems
Windows XP (32-bit)
Windows Vista (32-bit and 64-bit)
Windows 7 (32-bit and 64-bit)
Windows 8 (32-bit and 64-bit)
Windows 10 (32-bit and 64-bit)
Intel Mac OS X
Snow Leopard 10.6.x
Mountain Lion 10.8.x
El Capitan 10.11.x
Operating Systems that are not supported
Windows Servers of any type or variety are not supported including SBS
Windows XP (64-bit)
PowerPC Macs (G3, G4, G5) are not supported, nor is any version of Mac OS X 10.5 or below.
Mac OS X Server (10.6 and greater) can be backed up, but not all Server specific areas are allowed for backup, hence it is considered unsupported.
Linux, BSD, Unix and other *nix systems.
These operating systems are not supported and Backblaze can not be installed on them.
Alpha, Beta, Prerelease, and Preview operating systems
These operating systems are not supported. While Backblaze may be able to be installed, features, performance and validity of backups may not have been tested.