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Jan 11, 2016 4:19 PM in response to toddthephotographerby MrHoffman,Mail.app > Mailbox > Export Mailbox... will write out an archive in a portable format.
You can then archive that export, or can compress that into a single file for storage, and/or otherwise save the data.
If you want a date range, then you can either use a Smart Mailbox — those are basically saved searches — or can move the specified messages into a regular mailbox (folder) created for the export.