use the built in windows backup?
use another backup program.
cut and paste using explorer
use the robocopy command
download and use microsofts synctoy 2.1
enable mirroring in drive manager
there are lots of ways to do what you want but we can't help without knowing what you're atually trying to achieve. Are you looking to backup the whole drive, just your important files, want it to go into a compressed backup file, onto the other drive pretty much the way its stored on your main drive?