Best way to sync your iTunes library with multiple computers?

Hi,

I've spent two days looking for a slick solution for syncing my itunes library between my macs and my Drobo backup.

I have still not found a single easy good solution for this.
Currently my library is about 200 gb and i add music to it from two computers and have one backup on my Drobo.

Does anyone know how to best sync your libraries between the computers?
I've done the home sharing thing for a year but i still end up with different libraries since i delete things on one computer which doesn't get deleted on the next and so on.
I want them all to be 1-1 synced.

Best would of course to have it automated running o the background without having to manually select files that need to be transfered to the next device and so on.

I wonder it a program like carbon copy cloner is up for it, but it will probably sunc the music but not update the library.xml... so how would you do this?

Thanks

 

Thanks...

Today i have a local copy of my libray on my MP and also a copy of the entire library on my 4x2 TB Drobo which is connected to a mini which is my server and which i connect to from work to listen to my home music without the MP being on.
The Drobo also acts as a backup of my library.
I'm also often listen to music from my mini/drobo from my iPhone when i'm home.
Sometimes i add music on my mini and sync that over to my MP with home sharing and likewise the other way around.
But after a few months i notice that the libraries are different since home sharing doesn't delete files i feel i need some sync program that can make sure both libraries are identical.