ITunes Library: Keep 2 external HDDs in sync with same music files

I am trying to run iTunes with 2 external HDDs, keeping in sync with each other. One large one for my desktop and a second portable one to take away from home when I need to travel. What is the best way to do this?
What I have done so far is changing the location of my media library via iTunes advanced preferences to the other ext HDD and then consolidating my library, but I noticed that it tries to re-copy the entire library or at least part of it so I end up with music files like:
Back in Black.mp3
Back in Black 1.mp3
I'm sure this has been thought of before and an obvious solution should be available, but I've never been able to find one, so I'd be really glad if someone could tell me how to do this!

Jef Van der Voort wrote:
There are lots of sync and backup solutions but they always require the 2 hard drives being connected at the same time.
did you have a look @ ChronoSync ?
JGG

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