Hey ppl do i need to take any kind of backup before upgrading to 10.7.5 or mountain lion?

my question is that do i need to take backup before upgrading my OS?

If everything during the uograde works perfectly your data should not be touched.
Having said that, I don't know about you but I never trust my data to everything working perfectly. So I always back up. In fact I backup twice, once with Time Machine and the other is a clone done by SuperDuper.
You really should being backing up your data on a continuous basis.
Get an external disk and use either Time Machine or a cloning tool such as SuperDuper or Carbon Copy Cloner.
Allan

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