Recommendations - automatic backup / copy to 2nd drive same file structure?

I have the same file structure setup on 2 different drives one being a dedicated music backup. I know that there is a copy function available and have used it after processing my music into the main library but am wondering if someone can recommend a way to automate it since the only difference between the 2 drives is just the drive letter? I can manually do the copy to function but wondering if perhaps there is a way to add it into either an action or some other way?

There is currently no action to copy files.

I would not use MP3tag for backup purposes but more dedicated backup programs.
It is too easy to forget changed files.

For many years I have used the free version of SynchBack and it has rescued my behind on many occasions. It's easy to use and very flexible: SynchBack Free