Will upgrade from OS X 10.9.5 to OS X Yosemite delete my files or data?

I am using OS X Mavericks 10.9.5 on my Mac-book Pro. I am worried that upgrading to OS X Yosemite 10.10 may remove my data files. Do I need to secure my data first or continue upgrading without worrying?

You need to back the data up. While the upgrade itself normally won't delete your data, a problem may occur, and other things can.
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      1 2 GHz Intel Core i7 CPU: 4-core
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      Apple Inc. FaceTime HD Camera (Built-in)
      Apple Inc. Apple Internal Keyboard / Trackpad
      Apple Inc. BRCM2070 Hub
      Apple Inc. Bluetooth USB Host Controller
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          26% Safari
          2% WindowServer
          2% activitymonitord
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          0% WebProcess
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      125 MB Mail
      116 MB rapportd
      116 MB mds
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      1.78 GB Active RAM
      429 MB Inactive RAM
      1.07 GB Wired RAM
      422 MB Page-ins
      0 B Page-outs
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      Dec 6, 2014, 09:45:53 AM Self test - passed
      Dec 5, 2014, 11:49:18 PM QTKitServer_2014-12-05-234918_[redacted].crash

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