How to use an FTP server as backup space for Windows Server 2012

I wanted to use an FTP location as backup for scheduled Windows Server 2012 Backup.

I can't make it work because Windows refuses to accept the network location as drive. Even with "FTPUse" (socket error appeared, no idea why...) or "WebDrive" it didn't work out.

Many people suggested that WebDrive would be a nice solution. I was able to assign a drive letter to the FTP location and it appeared like that in Windows Explorer. But the Backup application of the server didn't let me pick it when I wanted to use "Back up to a volume" or "Back up to a shared network folder".

Any idea how I could get a workaround?

After trying again with Webdrive and reading their full documentation, I found a solution! I figured out that Windows only accepts the "Universal Naming Convention path" of backup storages. Webdrive creates such a path and it always is named like

\\Webdrive\YourNameOfFTPSite

Unfortunately, Windows does still not let me make the backup because it needs to be on an NTFS drive and my backup location is running on a Linux server. But this is another issue...