I don't know what version, but sometime with a recent update when you enter a username and password in CBB for a NAS drive, it is now caching that credential for Windows.

To explain further, I setup shares on NAS drives separate from Active Directory so that by default, you can't access it unless you put in a username and password.

I just setup a new server on CBB and the first thing I did was verify that the share was not accessible in Windows. I entered the path in Windows Explorer and I was prompted for a username/password. I did not enter anything, just canceled out of the prompt.

I then setup the NAS device in CBB so I can use it for hybrid backups. Once I set it up in CBB, I went back to Windows explorer and I can now access the backup share without any password prompt. So somehow CBB is caching those credentials for use within Windows.

This is a problem and it did not happen in older versions of CBB. The reason it is a problem is if it's caching the credentials for Windows users, it puts the NAS drive at risk for ransomware to encrypt. Previously after setting up a NAS drive like this, I would have to enter network credentials if I wanted to access it in Windows even if CBB had the credentials and was able to access it.