Who Can Help me with a backup rule?

Hi
I' m attempting to create a backup rule.
I have a folder named "Lesson" which contains other 3 folders "a" "b" "c" for example
I need hazel to monitor the "lesson" folder and sync it into a folder named "backup lesson" which is in my external hard drive.
I need that everytime I put some files or just rename a file in any of the subfolders (a,b,c) or in the main folder "lesson"
Hazel syncs into my "backup lesson" folder.
I need that cause I usually add into the "lesson" folder new audio files of my college' s
lessons and after adding them I rename the files.
basically I need that every time I change something in my lesson folder Hazel syncs into my backup folder.
I don't want to use dropbox cause the files are too big.
How Can I set a rule to do that?
I' m attempting to create a backup rule.
I have a folder named "Lesson" which contains other 3 folders "a" "b" "c" for example
I need hazel to monitor the "lesson" folder and sync it into a folder named "backup lesson" which is in my external hard drive.
I need that everytime I put some files or just rename a file in any of the subfolders (a,b,c) or in the main folder "lesson"
Hazel syncs into my "backup lesson" folder.
I need that cause I usually add into the "lesson" folder new audio files of my college' s
lessons and after adding them I rename the files.
basically I need that every time I change something in my lesson folder Hazel syncs into my backup folder.
I don't want to use dropbox cause the files are too big.
How Can I set a rule to do that?