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•All Your Data With the exception of your operating system, applications, or temporary files.

•Files up to 9 GB in Size The default of 4 GB can be raised or lowered in the preferences. iPhoto, Aperture and Lightroom use library bundles that will be backed up at any size.

•Connected Drives USB and Firewire hard drives and internal drives connected at the time of the install or added later in the settings panel.

•Not Network Drives Currently we do not backup network drives (NAS drives )

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"Excluded Files Backblaze does not want to waste your bandwidth or Backblaze datacenter disk space. Thus, we do not backup your operating system, application files, or temporary internet files that are transient and would not be useful in the future. You can see these exclusions by clicking on “Settings…” in the Backblaze Control Panel and selecting the Exclusions tab.

Some of these excluded files include:

-ISO (Disk Images),

-VMC VHD VMSN (Virtual Drives),

-SYS (System Configuration & Drivers),

-EXE (Application Files).

Backblaze also doesn't backup backups like Time Machine and Retrospect RDB. Backblaze also excludes podcasts in iTunes."