HT1338 if i upgrade my OS will i lose my data?

hey, i want to upgrade my mac from OS lion version 10.7.2 to 10.7.5 , if i download the software would it erase all data i have on my computer (apps, docs, etc) ?
Thank you!

Theoretically, no you don't have to erase and update/upgrade your OS.  However you should always back up when upgrading.  Through the normal upgrade process your data will preserved, however, there is always a slim chance something could wrong.  I would back up your data and upgrade with out worrying too much.  I've done plenty of upgrades without any issues.

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