I would leave ~/.m2 alone except for ~/.m2/repository.  You probably
want to continue using your settings.xml and suchlike.

~/.m2/repository is a cache for artifacts that Maven has fetched at
some time.  It's okay to remove it.  If you discard from there
anything that you will need, Maven will fetch it again and recreate
the necessary directory structure.

Every now and then, I delete ~/.m2/repository to clear away old
artifacts which may never be used again, as the projects I work on
evolve and come to depend on newer versions of their dependencies.

-- 
Mark H. Wood, Lead System Programmer   [email protected]
There's an app for that:  your browser

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