Unmap server backup drives

If you assign a dedicated drive to Window Server Backup it will not have a drive letter etc.

As for using Windows Server Backup to a Network Share, ensure server has limited number of administrators with proper password and that network share is limited to the backup service account

AFAIK, some variants of ransomware can encrypt mapped and unmapped files.

We are currently using Windows server backup to network share & it was hit by ransomeware so it was useless. I had a cloud backup that saved our tail although 2 days old. If I create a single backup service user with separate credentials, will that stop the ransomeware from accessing the backup files?? I realize it would make it harder but stop access totally?
Thanks

You may want to investigate the command-line net use command.  It sounds like it may be what you want.

https://technet.microsoft.com/en-us/library/bb490717.aspx

http://www.howtogeek.com/118452/how-to-map-network-drives-from-the-command-prompt-in-windows/

Still, imo it's a lot safer to plug a USB drive into the system, do the backup, and unplug it.

> If I create a single backup service user with separate credentials, will that stop the ransomeware from accessing the backup files?

That should help, as long as that account is not a vector for the ransomware. If the account is used strictly for the backup service, odds of exposure and thus infection is  minimized.

Basically, if any account that has  write access to a folder is affected by ransomware, then the folder can be compromised.

You should protect your most likely sources of infection first, i.e. your users.