Backup USB Drive with windows backup

I use an external SSD (SSD in mount case) for swap use. I, however, mostly use it for home use. The problem is that windows update won't allow me to add this device to file history, although he's is connected to the PC most of the time. I am getting the following error: "

Image:

Translation:

Create a backup of these directories

Unfortunately that won't work. If you would like to know more, search for error code 0x80070032

Add a directory

I tried searching for this error, but no answer suited what I needed. Searching for "Window backup of USB Drive" didn't give me any answers either.

In case you need specs:
OS: Windows 10
SSD: Samsung 970 EVO 1TB