No time machine in yosemite

  User-80F6A8C5-734E-4F1A-99D157D74BC2D04B 19:40 15 Dec 2014
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I have just discovered when I tried to restore a file that my Time Machine is not showing any backups. It was working fine until I upgraded to Yosemite. I have a 2012 iMac. Any advice most welcome

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