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No, When storing in sealed Mylar bags just use the same precautions as canned goods except Mylar bags are more fragile.
When properly sealed with an oxygen absorber the oxygen content is reduced well below the levels an vacuum sealer will provide.

Edit: Mylar bags and oxygan absorbers have revolutionized long term storage they can bring the oxygen level below .01%.
http://mylarpro.com/Info_FAQ.html
 
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