Left GP - What do I BackUp and HOW?

My company left Great Plains a couple of years ago for a different software and since then our computers have been replaced - all but the one that we've left Great Plains on.  The IT dept wants to get rid of this very old machine as well so I've been tasked to pull some kind of digital/excel backup of all the data in Great Plains so we have the details for years to come (after we no longer have the Great Plains software in the building).

I only have LIMITED experience with Great Plains - I am at a loss of what to pull and back up and how to do it.

Anyone have any suggestions?

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