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

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Files up to 4 GB in Size
This can be lowered in the preference panel.
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).

The Backblaze service backs up all your data. We believe you should not need to worry whether you selected all the files you care about, put any files in a different location on your computer, or added any new files that may not be included in your online backup. Therefore, we automatically select all your data.

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.

Backblaze organizes your online backup around the concept of "top level drives" that are selected to be backed up. When the Backblaze product is installed on your computer, it scans for any permanently attached hard drives (not network drives or removable media like CDROMs) and declares those hard drives are to be backed up. To add or remove a hard drive to be backed up, click “Setting…” in the Backblaze Control Panel and make sure the drive is selected.

At any time you can visit your account on the Backblaze website and see what files have already been backed up. Sign In to backblaze.com and select "View/Restore Files" to see the EXACT list of files.

Backblaze does not currently support backup of network mounted drives. We charge a fixed price per computer and backing up network mounted drives would allow a single Backblaze license to be shared among multiple computers or a workgroup. We realize many people have good reasons to backup data on network drives and we will be offering a solution for this case soon.

The Backblaze service is designed to protect the files you care about. Thus, we will keep a remote backup of any file that exists on your computer. Just in case, Backblaze will even keep multiple versions of that file for up to 30 days. However, Backblaze is not designed as an additional storage system when you run out of space. So, please don’t try to upload your external hard drive to us and delete your data off your drive…or we will delete those files from our servers as well.