Do I absolutely need to back up my computer before installing mavericks?

Hi,
I want to install Mavericks, but currently do not have a proper backup system in place. Is it absolutely necessary to back up my rMBP before installing?
I understand there is a risk in not backing up, but have there been many users experiencing loss of data after installation?

I'll be more blunt.
Not only is not related to Mavericks, not is it related installing software.
If you have anything of value on your computer, it is essential to have a regular backup system in place.
All storage devices ultimately fail if used for a long enough time. It can happen at anytime. It can also happen to a backup drive.
Many drives will be "junked" before they fail, but some will die early.
Your backup plan must account for that.

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