To briefly answer your question, you continue to use the same data path for your next fiscal year - you do not have to make a copy of your current year for the purposes of looking up detailed transactions after the year is closed.
Of course, you will want to make a backup of your data immediately prior to performing any year end functions such as closing the income statement accounts to retained earnings or closing the year, in case you realize something else had to be done and you need to get back in.
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Regards,
Softrak Tech Support