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I have Windows excel on my MacBook Pro. I accidentally saved one Excel file overtop another excel file. Is there anyway to recover the earlier file (the one I just saved over)?

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When data is overwritten, you write some cases iover the same file allocation place, so you are unavailable to recover that data because it changes, in other cases you data is saved in non contiguous place so you are avaliable to recover if it lost with many Data Recovery Software as PhotoRec avaliable to OSX too.

Usualy Office Software works in second way.

Reference Here

UPDATED:

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    This isn't generally correct. When many programs (I think including Excel) save a new file over an old one, they actually delete the old file and then create a new file with the same name. The new file might be allocated the same disk blocks that the old one occupied, but it also might not. May 20, 2015 at 15:14
  • @Gordon Davisson i did some research and you are right, ive updated the answer to provide the focused one. ty. May 20, 2015 at 15:34
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The original file is definitely lost, unless Time Machine managed to make a copy. However, you may want to check the autosave folder at ~\Library\Application Support\Microsoft\Office\Office 2011 AutoRecovery for the old file. Most probably this won't help though, since Excel should have saved the new file contents there as well.

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