Tips Archive FCP X

I am looking for tips to archive FCP X.

I have this Job: 3 TV Spot of a clothing store.
I have 1 Event with all my media and element (logo/Music/SFX,etc.)
I have 3 project my 3 TV Spot ( Summer clothes / Kids / Bathing Suit)

Now I want to archive only the media that I use ( I know it's the whole clip no handles option, hopes we have them in the near future).

My way but I hope there is another way, first I create a disk image, then put all the 3 project in 1 project and from there duplicate project selecting duplicate project + used clips and use my disk image for the location.
I know this work but I would like to know if there is a way to do the archive from my 3 project (3 TV Spot) without combining them in 1 project.

Thanks for the help,
Ricky Dominguez
Luna Films
Puerto Rico