It is not uncommon for security programs such as Windows Defender to mistakenly flag the Backblaze program as malware. As a result, our program may not be able to be installed or the program may malfunction. To fix this you can whitelist the Backblaze application inside Windows Defender, which will prevent Windows Defender from blocking our program.
1. Open up Windows Defender Security Center, and select Firewall & network protection from the left-hand menu. Under Public network click on Allow an app through firewall.
2. Next click on the Change settings button, and then click on Allow another app...
3. Then click Browse...
4. Locate the file named bztransmit.exe or bztransmit64.exe (Note the file path circled in the image below.)
Navigate to the location of bztransmit and choose the right version for your OS and click Open.
- For Windows XP, it's in C:\Program Files\Backblaze\bztransmit.exe
- For Windows Vista, 7, 8 and 10 32-bit, it's in C:\Program Files\Backblaze\bztransmit.exe
- For Windows Vista, 7, 8 and 10 64-bit, it's in C:\Program Files (x86)\Backblaze\bztransmit64.exe
5. Click Add. Repeat this for files bztrans_thread00 - bztrans_thread19.
6. Make sure that both Private and Public check boxes are ticked, and click Okay.
Windows Defender should now allow the Backblaze program to run without issue.