I'm upgrading to OS X Mavericks 10.9.3 from the Apple Store, do I need to back up the files?

I'm upgrading to OS X Mavericks because the App Store notified me. I'm still downloading it and it's a long way until I can upgrade it. Do I need to back up the files using Time Machine? I don't have any external hard disks with me right now and I'm worried if my data will lost after upgrade. Please answer. Thank you!

You need to backup files if you are trying to write the new OS X on the previous OS X partition. You will end up loosing all files & data if you replace the Mavericks with the old OS Xon same disk. But if you have another partition ready for the Mavericks then no worries. I did the same when I downloaded 10.9 from Apple. I too had Stellar Drive Clone software ready to backup my entire hdd. Actually, you should have a backup utility for one  or many reasons.

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