Solve : Excel overwrites vital data?

1.	Solve : Excel overwrites vital data?
Answer» I track my self-employed hours of work and details of meeting on an Excel file. Each WEEK I create a separate tab. Today I copied and renamed a tab for this week's work and BEGAN editing it. To my horror, the edits I made on this week's tab were replicated on all (40+) tabs. It looks like all that data is LOST. Is there a WAY to recover my old information? ThanksIf no backup file, all data is gone.

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