Inherit Backup State

Inherit Backup State

The Inherit Backup State feature allows a new installation of the Backblaze software to inherit an existing license and backup under the same account. This will prevent the unnecessary re-upload of files that have previously been backed up. This is useful in a number of circumstances, such as the following examples: 

  • The Backblaze software was uninstalled and reinstalled on the same computer and no data has been lost, or the lost data has already been restored.
  • The Backblaze software was installed on a new computer and the data on the new computer matches that of the computer previously licensed for Backblaze backups. 
  • The Backblaze backup was Safety Frozen

If you wish to create an entirely new backup, discarding the old one, follow this process instead. 

If there is any data that exists only in the original backup, do not start the Inherit Backup State process. First, restore that data from the original backup to the current computer.  


To start the Inherit Backup State process, a trial of the Backblaze software must first be installed on the computer. If an existing installation already exists, uninstall and reinstall the Backblaze software. To install a fresh copy of the Backblaze software, follow these steps: 

  1. Visit the Backblaze login page and sign in to your Backblaze account with the registered email address and password.
  2. On the "Overview" page, select the appropriate download link for your operating computer at the lower right corner.
  3. Run the installer you downloaded to setup a new trial. 


Once an active trial has been installed, the Inherit Backup State process can be initiated. Make sure all drives you'd like to retain from the older backup are connected to the computer. 

  1. Reboot your computer to make sure all Backblaze files are unlocked.
  2. Once the computer reboots, choose "Inherit Backup State" from the Backblaze settings, menu bar icon (Mac), or task bar icon (Windows). See the screenshots below. 
    Can't find the menu? See this article.
  3. Provide your email address and password for your Backblaze account and choose "Sign In".
  4. In the list, choose the previous backup to inherit.







After the Inherit Backup State process starts, Backblaze will queue up the entire contents of all drives selected for backup. At this point, double check that all desired drives are connected and selected correctly in the settings as shown above. As each file comes up in the queue, it's checksummed to create a digital fingerprint. That checksum is then compared to the contents of the inherited backup. During this process the Backblaze software will report it is in the initial backup phase.

If the file exists on our servers, only a summary will be transmitted - things like a new name, location, or new date would be transmitted.

If the file doesn't exist on our servers, then the whole file will be transmitted. For large files, they're segmented first, then each segment is checked under the same process.

If a file is in the inherited backup, but not on the new computer, it will be purged from the backup, just as with files that have been deleted or removed from the computer for more than 30 days. 

The end result is that files already backed up will not be transmitted again, any new or changed files will be uploaded, and your backup will be accurate with as little time and bandwidth used as possible.

For a visual guide on how the Inherit Backup State feature works, refer below:



Following a successful inherit, the application will be connected to the existing licensed backup and will also inherit the name of the existing backup. 

Note: Backups cannot be inherited cross platform. A Windows backup can only be inherited by a Windows computer, and a Mac backup only by a Mac.  

Mac Only: If Migration Assistant or a Time Machine backup was used to transfer the data from the old computer to the new, the Backblaze software will need to be uninstalled and reinstalled before proceeding. 

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