The answer is that usually you’re ok and there shouldn’t be any re-linking but in reality, you need to test the archive as soon as it’s created because, in my experience at least, FCPX is very good at leaving things out and I never fully trust it to have archived things properly.
Open the FCPX library package in the Finder and check that all the media is actually there and not just an alias, waiting to make your life miserable later on.
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Jeff Kirkland | Video Producer & Cinematographer
Hobart, Tasmania | Twitter: @jeffkirkland