Mac OS Which is the best?

  sanyalps1 10:11 15 Mar 2017
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I have recently installed Sierra on my MacBook Air after which the battery getting discharged at much faster rate. Earlier I could work for 12 hours after the battery fully charged but the same has now come down to 5-6 hrs. Could someone please suggest any remedy and/ or any other better OS?

  mgmcc 15:59 16 Mar 2017

Can you use Time Machine to restore the MacBook Air to its previous operating system version?

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