Why does Backblaze error with "Backblaze could not create a read-writable '.bzvol' directory on that hard drive." when I try to select a drive for backup?
Backblaze uses a hidden folder named .bzvol at the top level of every drive selected for backup. The directory contains a small file to uniquely identify the drive.
If Backblaze can't create a .bzvol folder, it will produce said error.
If your operating system can read the drive but can't write to it, it will produce this error. Most commonly, this applies to Mac OS X and NTFS drives. Transfer the files to another drive, erase the disk as Mac OS Extended (HFS+) and put the data back on. Then it can be selected for backup.
- Show hidden files if they're not already shown: http://windows.microsoft.com/en-us/windows7/show-hidden-files
- Open the drive's top level in Windows' Computer area
- If a .bzvol folder exists, delete it. Close the drive's top level window.
- Right click on the drive itself, and choose Properties -> Security
- See if SYSTEM is listed. If it's listed, make sure it's set for Full Control. If it's not listed, or isn't listed as having Full Control, click Edit
- Click "Add", enter "SYSTEM" (all caps) in the Object Names field, and click OK
- Make sure SYSTEM has "Allow" checked for all columns. Click OK, and OK again.
- Reboot, then select the drive in the Backblaze control panel
- Locate the drive in the Finder
- Click on the drive once to select it
- Pull down File and choose Get Info
- In the Sharing & Permissions section, click the lock icon and enter your Mac's administrator credentials
- Ensure that system or me has Read & Write privileges
- Select the drive for backup in the Backblaze system preference